Hello, what update did you push to your computer? OS X Mavericks? I'd first try to reset the preferences of Photoshop.
Yes i updated to OS X mavericks and i tried to method but somehow the weird keyboard-shortcuts are still there
I would then uninstall-reinstall.
Could be corrupt preferences / keyboard shortcuts.
Or it could be something else going wrong in MacOS 10.9.
1) While in Photoshop, go to 'Keyboard Shortcuts' under the 'Edit' menu in the Mac's menu bar. The 'Keyboard Shortcuts and Menus' panel opens.
2) With the 'Keyboard Shortcuts' tab selected (as opposed to 'Menus'), double-click 'File' (has a triangle next to it) under the 'Application Menu Command' and select/highlight the 'Open...' command.
3) Without editing the key shortcut in any way, click the 'Accept' button to the right. Then 'Okay' to close the panel. This successfully reinstates the 'Open' keyboard shortcut.
4) At this point, you're probably thinking, 'My god, I'm going to have to repeat this process for every single keyboard shortcut...'. But no, simply 'accepting' the 'Open' command appears to successfully reinstate every other keyboard shortcut too!
I am dealing with the EXACT problem and it is extremely frustrating. Nothing that I did has changed anything. I fiddled with the settings, restarted my computer, and even uninstalled, and reinstalled photoshop multiple times and nothing seems to change!! I think this has been happening since about the time I upgraded my OS to Mavericks.. I really need help here.