Thank you for the replies.
I have two other IDE issues (in 10.4), which may be related. (I have all three patches installed.)
(1) Sometimes Refactor/rename works but most of the time the top few items on the refactor menu are disabled.
(2) Sometimes Find Declaration works but most of the time it doesn't.
I know that for both of these need to have a good compile to work, but I do that. Are these problems related to the first one?