>>My guess would be that disabled menu item has something to do with START.MPR. To verify that, start fresh copy of VFP and try to modify some class. Make sure that you don't use righ-click before that. If property Window menu is enabled than it's start.mpr.
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>Well, the same weird thing happens when I try to do CTRL+F, for example, to search within a method, if I have launched the project from that menu. Something remains in memory from the right click and affects the normal behavior of the menu and the search. With the search, as soon as I do CTRL+F, the class closes by itself.

Are you using NOWAIT clause in MODIFY PROJECT in start.mpr? Try to add it if you don't have already.