Interesting, definitely something that should be investigated
Please supply your OS and computer specifications for Khaled to have a look at.
Personally, I'm on XP home (sp2), 160gb, 256mb ram/3ghz, and have no problems in scrolling, despite having maximum buffer specified in mIRC options. As usual, please make sure this happens in a fresh install of mIRC to make sure that it isn't the result of a third party script.
Regards,
