Are you sure you don't have any DLL files loaded that might be causing this? I've never seen this before except when an older (pre-6.2) DLL is "docking" or otherwise messing around with mIRC's children controls (treebar, switchbar, toolbar, MDI). These older DLL files have not been programmed to handle the treebar control or multiple line toolbars, since these abilites are new to mIRC 6.2.
