Reload settings will not try to re-read ivysettings.xml file after failure to find file at start-up (possibly due to Eclipse variable substitution)

OVERVIEW
=========
In running through several outage cases in our group's use of Ivy, I ran into an interesting start-up case.

Right now our common ivysettings.xml file is housed on a file share. If we have a network outage before the user starts up Eclipse, IvyDE will of course give an error. However, when the file share becomes accessible again a "Reload settings" from the ivy.xml container or a "Resolve" will still fail. I have also tested the much simpler case of simply renaming the ivysettings.xml file before starting Eclipse to simulate a file share disruption, which also results in the same issue.

REPRO
======
1)
Have Eclipse setup with at least one project using Ivy/IvyDE and referencing an ivysettings.xml file on a file system. (i.e. file:/path/to/ivysettings.xml)

2)
Close Eclipse

3)
Rename the ivysettings.xml file to something else

4)
Launch Eclipse (now without access to the ivysettings.xml) and we get the error:
Error while resolving the ivy instance for ivy.xml in 'MyIvyProject':
Unrecognized variables in the Ivy settings file ${workspace_loc:MyIvyProject/P:/Ivy/common/ivysettings.xml}

Make note that it's considering the absolute file path a VARIABLE for some reason.

4)
Rename the file back to ivysettings.xml

5)
Attempt a resolve, reload, refresh, etc., all result in the same error:
Error while resolving the ivy instance for ivy.xml in 'MyIvyProject':
Unrecognized variables in the Ivy settings file ${workspace_loc:MyIvyProject/P:/Ivy/common/ivysettings.xml}

Here is the stack trace:
org.apache.ivyde.eclipse.IvyDEException: Error while resolving the ivy instance for ivy.xml in 'MyIvyProject':
Unrecognized variables in the Ivy settings file ${workspace_loc:MyIvyProject/P:/Ivy/common/ivysettings.xml}
at org.apache.ivyde.eclipse.cpcontainer.IvySettingsSetup.getResolvedIvySettingsPath(IvySettingsSetup.java:64)
at org.apache.ivyde.eclipse.cpcontainer.IvyClasspathContainerConfiguration.getInheritedIvySettingsPath(IvyClasspathContainerConfiguration.java:213)
at org.apache.ivyde.eclipse.cpcontainer.IvyClasspathContainerState.doGetIvy(IvyClasspathContainerState.java:144)
at org.apache.ivyde.eclipse.cpcontainer.IvyClasspathContainerState.getIvy(IvyClasspathContainerState.java:136)
at org.apache.ivyde.eclipse.cpcontainer.IvyResolveJob.run(IvyResolveJob.java:69)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: org.eclipse.core.runtime.CoreException: Variable references non-existent resource : ${workspace_loc:MyIvyProject/P:/Ivy/common/ivysettings.xml}
at org.eclipse.debug.internal.core.variables.WorkspaceResolver.resolveValue(WorkspaceResolver.java:56)
at org.eclipse.core.internal.variables.DynamicVariable.getValue(DynamicVariable.java:54)
at org.eclipse.core.internal.variables.StringSubstitutionEngine.resolve(StringSubstitutionEngine.java:267)
at org.eclipse.core.internal.variables.StringSubstitutionEngine.substitute(StringSubstitutionEngine.java:192)
at org.eclipse.core.internal.variables.StringSubstitutionEngine.performStringSubstitution(StringSubstitutionEngine.java:86)
at org.eclipse.core.internal.variables.StringVariableManager.performStringSubstitution(StringVariableManager.java:573)
at org.apache.ivyde.eclipse.cpcontainer.IvySettingsSetup.getResolvedIvySettingsPath(IvySettingsSetup.java:62)
... 5 more

NOTES
======

• Why is the file URL changing to a variable substitution? I used the "File System" button to select the file in the Classpath Container settings window.
• This issue DOESN'T occur if during an Eclipse session you lose access to the file, attempt to reload settings (fail), restore the file, and attempt to reload again.

WORKAROUNDS
==============

• Close Eclipse, restore ivysettings.xml file, start Eclipse
• Go back in the Classpath Container settings window and press OK