My InDesign doesn't "snap" to anything, nor guides, nor picture frames, etc etc.... I don't find how to fix it! It really seems a silly thing but I never had this problem before with CS5. Any help? Thanks
Have you turned on Smart Guides in the prefs and enabled snapping from the View >Grids and Guides menu?
Now I have, but I didn't turn them off in the first place... or not that I noticed - weird!