My setup
I'm running FlashFXP 4.2.3 (build 1771) on Windows 7 Professional. I have two screens and often find myself with more than 20 open windows (and 4~ FlashFXP ones).
Because it quickly gets confusing with 20-ish windows open, I tend to minimize all of them by pressing Win+M and then open up the window that I want at that particular moment.
The issue
FlashFXP disappears from the taskbar and appears as an odd mini-window that I cant click to restore (unless I right-click and press "Restore").
Normal "minimize window" click
Win+M