Uploading Libreoffice-format files only results in "Deleted"

I upload a file in .txt or .xls format and get only Deleted on the whiteboard. The same files worked in my previous installation OM 2.0. The corresponding contents of log/openmeetings.log is:

DEBUG 12-19 15:31:55.589 ScopeApplicationAdapter.java 96281967 2593 org.apache.openmeetings.remote.red5.ScopeApplicationAdapter [http-bio-0.0.0.0-5080-exec-3] - newMessageByRoomAndDomain RPC:newMessageByRoomAndDomainorg.apache.openmeeti
ngs.documents.beans.UploadCompleteMessage@71181da3
ERROR 12-19 15:31:55.590 ScopeApplicationAdapter.java 96281968 2534 org.apache.openmeetings.remote.red5.ScopeApplicationAdapter [http-bio-0.0.0.0-5080-exec-3] - [sendMessageWithClient]
java.lang.NullPointerException: null
at org.apache.openmeetings.remote.red5.ScopeApplicationAdapter.sendUploadCompletMessageByPublicSID(ScopeApplicationAdapter.java:2530) ~[openmeetings-2.1.0-SNAPSHOT.jar:na]
at org.apache.openmeetings.servlet.outputhandler.UploadController.sendMessage(UploadController.java:190) [openmeetings-2.1.0-SNAPSHOT.jar:na]
at org.apache.openmeetings.servlet.outputhandler.UploadController.handleFileUpload(UploadController.java:130) [openmeetings-2.1.0-SNAPSHOT.jar:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.6.0_32]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) ~[na:1.6.0_32]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) ~[na:1.6.0_32]
at java.lang.reflect.Method.invoke(Method.java:597) ~[na:1.6.0_32]
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:213) [spring-web-3.1.1.RELEASE.jar:3.1.1.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126) [spring-web-3.1.1.RELEASE.jar:3.1.1.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96) [org.springframework.web.servlet-jar-3.1.1.RELEASE.jar:3.1.1.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617) [org.springframework.web.servlet-jar-3.1.1.RELEASE.jar:3.1.1.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578) [org.springframework.web.servlet-jar-3.1.1.RELEASE.jar:3.1.1.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80) [org.springframework.web.servlet-jar-3.1.1.RELEASE.jar:3.1.1.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923) [org.springframework.web.servlet-jar-3.1.1.RELEASE.jar:3.1.1.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852) [org.springframework.web.servlet-jar-3.1.1.RELEASE.jar:3.1.1.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) [org.springframework.web.servlet-jar-3.1.1.RELEASE.jar:3.1.1.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789) [org.springframework.web.servlet-jar-3.1.1.RELEASE.jar:3.1.1.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647) [tomcat-embed-core-jar-7.0.34.jar:7.0.34]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) [tomcat-embed-core-jar-7.0.34.jar:7.0.34]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) [tomcat-embed-core-jar-7.0.34.jar:7.0.34]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [tomcat-embed-core-jar-7.0.34.jar:7.0.34]
at org.red5.logging.LoggerContextFilter.doFilter(LoggerContextFilter.java:77) [red5.jar:na]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [tomcat-embed-core-jar-7.0.34.jar:7.0.34]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [tomcat-embed-core-jar-7.0.34.jar:7.0.34] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) [tomcat-embed-core-jar-7.0.34.jar:7.0.34] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) [tomcat-embed-core-jar-7.0.34.jar:7.0.34] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) [tomcat-embed-core-jar-7.0.34.jar:7.0.34]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) [tomcat-embed-core-jar-7.0.34.jar:7.0.34]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) [tomcat-embed-core-jar-7.0.34.jar:7.0.34]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) [tomcat-embed-core-jar-7.0.34.jar:7.0.34]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) [tomcat-embed-core-jar-7.0.34.jar:7.0.34] at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004) [tomcat-embed-core-jar-7.0.34.jar:7.0.34]
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) [tomcat-embed-core-jar-7.0.34.jar:7.0.34] at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) [tomcat-embed-core-jar-7.0.34.jar:7.0.34]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [na:1.6.0_32] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [na:1.6.0_32]
at java.lang.Thread.run(Thread.java:662) [na:1.6.0_32]DEBUG 12-19 15:31:55.613 WhiteBoardService.java 96281991 481 org.apache.openmeetings.remote.WhiteBoardService [pool-8-thread-945] - startNewObjectSyncprocess: ada263624a61be324465b06c241e7359.swf1355923915610
DEBUG 12-19 15:31:55.613 WhiteBoardObjectListManager.java 96281991 110 org.apache.openmeetings.remote.red5.WhiteBoardObjectListManager [pool-8-thread-945] - getWhiteBoardImagesSyncListByRoomAndImageid room_id: 1
DEBUG 12-19 15:31:55.613 WhiteBoardObjectListManager.java 96281991 115 org.apache.openmeetings.remote.red5.WhiteBoardObjectListManager [pool-8-thread-945] - getWhiteBoardImagesSyncListByRoomAndImageid roomList: {}
DEBUG 12-19 15:31:55.614 WhiteBoardObjectListManager.java 96281992 116 org.apache.openmeetings.remote.red5.WhiteBoardObjectListManager [pool-8-thread-945] - getWhiteBoardImagesSyncListByRoomAndImageid object_id: ada263624a61be324465b06c
241e7359.swf1355923915610
DEBUG 12-19 15:31:55.722 DownloadHandler.java 96282100 124 org.apache.openmeetings.servlet.outputhandler.DownloadHandler [http-bio-0.0.0.0-5080-exec-7] -
query = fileName=ada263624a61be324465b06c241e7359%2Eswf&moduleName=videoconf1&parentPath=%2Fada263624a61be324465b06c241e7359%2F&room_id=files&sid=5106eb19d8a64214f59cb97cd0a40552
DEBUG 12-19 15:31:55.722 DownloadHandler.java 96282100 125 org.apache.openmeetings.servlet.outputhandler.DownloadHandler [http-bio-0.0.0.0-5080-exec-7] -

fileName = ada263624a61be324465b06c241e7359.swf
DEBUG 12-19 15:31:55.722 DownloadHandler.java 96282100 127 org.apache.openmeetings.servlet.outputhandler.DownloadHandler [http-bio-0.0.0.0-5080-exec-7] -

parentPath = /ada263624a61be324465b06c241e7359/
DEBUG 12-19 15:31:55.723 DownloadHandler.java 96282101 140 org.apache.openmeetings.servlet.outputhandler.DownloadHandler [http-bio-0.0.0.0-5080-exec-7] - sid: 5106eb19d8a64214f59cb97cd0a40552DEBUG 12-19 15:31:55.742 DownloadHandler.java 96282120 220 org.apache.openmeetings.servlet.outputhandler.DownloadHandler [http-bio-0.0.0.0-5080-exec-7] - requestedFile: ada263624a61be324465b06c241e7359.swf current_dir: /var/www/openmeet
ings/webapps/openmeetings/upload/files/ada263624a61be324465b06c241e7359
DEBUG 12-19 15:31:55.742 DownloadHandler.java 96282120 230 org.apache.openmeetings.servlet.outputhandler.DownloadHandler [http-bio-0.0.0.0-5080-exec-7] - LOG DownloadHandler: The request file is not readable
DEBUG 12-19 15:31:55.742 DownloadHandler.java 96282120 234 org.apache.openmeetings.servlet.outputhandler.DownloadHandler [http-bio-0.0.0.0-5080-exec-7] - LOG ERROR requestedFile: ada263624a61be324465b06c241e7359.swf
DEBUG 12-19 15:31:55.743 DownloadHandler.java 96282121 260 org.apache.openmeetings.servlet.outputhandler.DownloadHandler [http-bio-0.0.0.0-5080-exec-7] - full_path: /var/www/openmeetings/webapps/openmeetings/default/deleted.swf