Which windowmanager and Desktop Environment are you using? see http://bugs.winehq.org/show_bug.cgi?id=24265 As a possible workaround, does Alt-Tab (a few times) bring the mirc window back?
Which windowmanager and Desktop Environment are you using? see http://bugs.winehq.org/show_bug.cgi?id=24265 As a possible workaround, does Alt-Tab (a few times) bring the mirc window back?