I agree, your case looks like a leak.
The first thing I would do if I were you would be to update to the most recent v2 build, which is 58g (release candidate 8) at the moment. A lot of bugs have been fixed since build 45; we can hope yours is one of them. It might not be, but at least those bugs fixed since build 45 will no longer be a source of concern.
-Paul
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