At the time of doing this these files were checked out by someone else on a different PC, however I had other files checked out to me that I would of expected to see within the Show Pending Checkins screen.One thing of note:
$/PlasmaSolution/UIContractsProject/NewUnit/frmNewUnitWizard.vb and $/PlasmaSolution/UIContractsProject/NewUnit/frmNewUnitWizard.resx
are both checked out to a different machine than the current one - is that expected? You might check Properties in the Vault client for their check out location, and verify they are checked out to the current machine.
However, that shouldn't be causing the problems you are seeing.
I will try opening from source control and pointing to a different working folder to see what happens.
This seems to have fixed the problem