I can't remember ever seeing a "more" option in the right-click menu so I tried a few different applications/files before posting and am still none the wiser?
Could you give one specific example (I know you said its with any, but it'd help if we were reading off the same page- so to speak) of where you are doing this and where the "more" option appears to cause the crash.
Do you have any extra extensions/plugins added to your system which might give you this "more" option? If you've installed something third-party which 'optimises' your computer this could be responsible.
Also, if you haven't tried it already, it might be worth repairing your permissions in the Disk Utility application- it may not help but its always worth a shot if something is acting up.