Custom Property File "P u n c h I D" bug?

I'm not sure if anyone else is seeing this issue...

We just updated to 2012 SP2 across the board.  We maintain a short custom property list in a text file shared on the network.

Every time any user attempts to view a file's custom properties (file - properties) or switches between tabs in the window (custom / configuration specific), the text: "P u n c h I D" (no quotes) is appended to the custom property file.  After this is repeated ~10 times, the property window fails to function for all users until the custom proprty list is repaired (extra text deleted) or removed.

As this happens fairly quickly, repeatedly repairing the file is not a usable workaround.  Setting it to "read only" causes an error message when solidworks tries to write to the file.  Currently, I have the file disabled completely (renamed it so SWX can't find it.)

Anyone else seen this?  Known issue?

SolidworksParts And Features