Quote:
mIRC's titlebar color changes to indicate that it's the active application, even though by taskbar state it is not.

I have not been able to reproduce the above issue so far. The titlebar color is actually controlled by Windows, so it looks like Windows is getting confused in this situation. It may be due to a combination of how mIRC is setting the window focus and/or your Windows settings.

Quote:
The button of the channel that was joined via timer is highlighted and now remains highlighted even after you activate mIRC again

I have been able to reproduce the above issue. Focusing is a tricky problem - it triggers a whole range of features - and one small change in the focus routine work can result a number of side-effects. I have made a change that should resolve it but will need more testing before it makes it into the next version.