Is anyone having problems with selecting parts within the feature manager whilst in an assembly. I open an assembly and everything behaves as expected, after working for 15 mins or so the selection behaviour changes, it will not expand a part with one click, I have to double click to expand the cross and also I cannot select a part to move it's position in the feature tree or drag it into an assembly. I seem to remember this behaviour from 2003, but our whole office has moved to 2005 and all are having this problem. Regards Simon Miller