Your comments

Yep, V0.2.7.822*.
This is on Win7 x64

As I said above, the behaviour you did works, (it does open the main window when it is run again), but only if the window is minimized in taskbar. When it is minimized to *tray*, it runs another instance.
Hi Kevin! Thanks a lot for improving the program. For a temporary solution - it does work.
The main problem is that when I close it (which sends it to tray) and run the program again, it runs another instance of Wieldy. Nothing appears and nothing happens but I can see two wieldy.exe's in the task manager.

Another suggestion is to perhaps have an option to always minimize it to tray?
If you can throw it up quickly with a shortcut (eg. one that runs wieldy.exe) or a gesture, you dont need it taking the space on the taskbar..