I've searched many forums, but can't find a solution to my exact problem.
My keyboard commands (shift, option, command, space bar) are not working in Illustrator CS4 (Mac). They DO work in Photoshop still. I have of course trashed Preferences, restarted, etc. I've also tried switching keyboard layouts. I can still type a letter and get a new tool, such as H for hand, but I cannot be efficient this way. I particularly need the zoom in & out tools.
There have been a spate of complaints along these lines lately, and I have to wonder what the heck is going on.
Many discussions on this topic. I know the search feature here sucks, but try a simple search phrase, like 'shift key,' constrain the search to Illustrator (using More Options), then sort by date.
What you're talking about, technically, is not 'keyboard shortcuts' but, rather ' modifier keys.' Your search parameters might have caused your lack of hits.