The if's and fi's have to be balanced. Assuming there are no more "if"'s in (A) in the dotted parts, then (A) will definitely NOT work.

In the original post, unless there is an additional "if" in the beginning, the first snippet is not valid. Which would explain why th unmounting didn't work. The second snippet looks correct (and is the one that is supposed to be working anways).

What's the problem?

Martin