INVENTOR 2012 constraints 3D recognition

[pompeo79]

Hi,

i have  a problem in assembly enviroment with the assignment of the 3D constrants.

This problem happen suddendly yesterday.

To  infer the constraints (for ex. mate)  hovering the cursor over the faces no gliphs appears...

i have to wait like 8/9 second to obtain the gliph appear and so, finally, apply the constraint.

I have a ok hardware and software  settings ( win7-64, nvidia, etc). I have other machines identycal that works fine,without this problem.

I have (re)installed sp1, and repair installation too for security.

I have tried the hardware settings (compatibility, performance, etc) too with no success.

Any ideas?