defraggler doesn't react anymore

After some period of time (I haven't measured it yet) I can't get Defraggler to come up to the front any more. When I click at the task bar icon there's a strange behaviour of Defraggler (s. screenshot). Any idea what might have caused it? I run Defraggler on Vista x64.

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Hi William.

I have XP SP3, and I've had that strange issue with Defraggler before, and I don't know what caused it. It minimises and then won't restore again, or in one instance it restored to an odd shaped window at the top left of the screen.

The only fix I found was to reinstall Defraggler.

The devs read these posts, so I'm sure they'll look at this.