Select a text layer, from the fx drop down select drop shadow, the fx panel comes up but with inner glow selected and not drop shadow. Have tried this on multiple documents all with same result.
Running Photoshop CS6 13.0.1 (with the latest security patch applied), Window 7 x64 with latest Intel 4000 drivers installed. Screen shot below shows the fx panel after selecting drop shadow
Tested in the 32 bit version and OK, as well as both versions of CS5 and they were OK. But problem persistent in the 64 bit version. Bit the bullet and trashed my pref's file and now back to normal. So something must have gotten stuck as I was using Inner Glow on a few text layers earlier.
Mike
ps I hate having to trash the pref's file :(
So unless there is something you can see using other effects that caused the issue I will put this down to one of those many gremlins that are out there