Confirmed Here:
Windows 2000 SP4, 200MB Ram, Pentium II 350MHz
How Reproduce:
1) Open "mIRC Options" Dialog
2) Select: Display > Options > Tray..
3) Check "Place mIRC in tray when minimized"
4) Click ok
5) Click on minimize button
6) When in tray, click on the mIRC tray icon, and when mIRC appear in the switchbar, click on it as fast as possible.
mIRC DISAPPEAR Magically
