I haven't seen this myself. Even Adobe updates don't reset the shortcuts.
When it resets, what Layout does it show you using? Custom still, or has that reverted back to CS6?
Good question. If/when it does it again, I'll check. However, until you asked that, I never noticed the keyboard layout options and that one of them is CS5.5. That's an easier fix for me than re-customizing everything, as I was just wanting the CS5 layout.
Something else I noticed is that my workspace is set for "Import from Project" and I'm supposing it's possible that the keyboard layout is connected to the workspace and might be either resetting it to CS6 or custom, which may or may not have had those customizations. About 25% of the projects I'm working on currently are pre-CS6, so every time I load one of those up, it might be making everything else go wonky.
In any event, I have a better idea what to look out for now. Thanks
I know the workspace is tied to the project, so that if John opens Tom's project, John will see Tom's layout. I wouldn't be surprised if opening older projects is the cause of your issue here either. CS6 changed a lot of keyboard shortcuts.
It happens to me in CS5.5 and I always use the same workspace.
It seems to happen only to certain shortcuts (specifically go to next and previous markers).