I searched the forum as well as google and could find nothing on this, so am posting here. Maybe it's old news.
WARNING: Make a backup of the C file used in the test below.
Using uVision 3.05c (and who knows, maybe other versions as well) open up any C file, place the cursor anywhere (it seems) and press Ctrl+U. Save the file, then reopen it. You'll notice that every character in the file is now lower case. Perhaps it's every character after the cursor ... I'm not sure of the specifics.
Considering that C is case sensitive, you can imagine how this could cast a gloom over ones day.
That's it. Obligatory condescending responses may now commence.
uVision - as in UV3.EXE - is a single application that provides an Editor, a Debugger, a Simulator, and a Project manager. All that stuff is a single, indivisible thing - so I think it is fair to say that a bug in the uVision editor is a bug in uVision.
On the other hand, the compiler, assembler, linker, librarian, downloader, etc are distinct applications which can be run independently of uVision.
PS
The above lists may not be exhaustive.