mvn release:prepare fails with IOException and a write error (Access is denied)

When running

mvn release:prepare -Dusername=<perforce_user> -Dpassword=<perforce_password>

I get the errors:

• java.io.IOException: The filename, directory name, or volume label syntax is incorrect

• [ERROR] CommandLineException Exit code: 1 - Usage: add/edit/delete [-c changelist#] [ -d -f -k -n -v ] [-t type] files...
  Missing/wrong number of arguments.

• [ERROR] Failed to execute goal org.apache.maven.plugins:maven-release-plugin:2.3.1:prepare (default-cli) on project root-project: Error writing POM: D:\Server\pom.xml (Access is denied) -> [Help 1]

The full output is attached.

Sometimes I also get the error:

• [ERROR] D:\Server\pom.xml - file(s) not in client view.

Though I created the client in the same location I'm running from, and I'm not sure that error is related to the others (as the others also occur when that one doesn't).

It's been suggested (on stackoverflow: http://stackoverflow.com/questions/10999403/maven-releaseprepare-ioexception) that the error has to do with my D drive being a mapped drive, though I don't think it is as it's not listed if I run subst. However, I think it must be at least a partition on the same hard drive, unless my PC has three physical drives (work PC), but I guess that shouldn't make any difference to the program?