Hi! I have never seen the dialogbox before. Could you try the followings and see if it makes a difference?
1) Before you start Inventor, right-click on the Inventor icon on desktop -> Run as Administrator.
2) Go to start menu -> Autodesk -> find the Inventor folder -> Tools -> Add-In Manager -> turn off all Add-Ins. Then restart.
Or, the disk space allocated to you is too small and Undo files cannot be written properly.
Thanks!
It almost looks like you aren't using a Project File for Inventor.
Hey,
I had the same problem. The reason was that there was not enough space on the hard disk. I removed some other files en photo's and the problem was solved.
jef