path not found errors in Inventor 2012

[pitsingerk]

I am having issues with my Inventor 2012, Windows 7 64bit, service pack 2 installed.  This is happening only on my machine, we have 4 others being used at the same time.  When I try to save a file, I am getting a "path not found" error, an example of the file path r:\engineering\inventormodels\anchor.  If I change the location to r:\engineering\inventormodels, one level up, the file will save.  I have a few hundred sub folders under inventor models and none of them will let me save a file.  If I go up down one level to the r:\engineering\inventormodels it will.  Since is only happening on one of our machines, this makes absolutely no sense to me. Through explorer, I can copy a file and paste it in any of the subfolders telling me that this is an Inventor issue.  Any help as to what could be causing this will be greatly appreciated

[pitsingerk]

I have Inventor 2013 loaded also and tried creating a new file and saving it to the directories that would not save in 2012, I have no issues with the 2013 files.

[pitsingerk]

Anyone have any thoughts here, I'm really struggling here.  I've gone full blown 2013 since the first request for help.  The problem followed from 2012 to 2013.