In Photoshop and all of my other CS5.5 apps, the shortcut commands (ie. command S to save, command P to print, etc) work fine. The problem is that none of them work in indesign. I think something got screwed up in the settings and I can't find where to change it back. Help please! It's annoying that I can't copy and paste using shortcut commands!
The generic first step with problems like this is to try replacing your InDesign preferences. Reading the first page of the linked thread should give you more than enough info to try it out. It resets your ID preferences (including keyboard shortcuts) back to the way they were when ID was first installed.
If that doesn't work, you should probably tell us what operating system you're using, and whether or not those shortcuts ever worked in ID.
I have the EXACT same problem! Did this solution work for you? It looks complicated so I don't want to mess with stuff until I'm sure it works.