Service Packs or other Windows updates make changes to a variety of things, including networking. It's possible that some change there is your problem, especially because it was working fine before. Now, you already know your version of mIRC is old. Before anything else, please try the latest version without any scripts just to see if it works. That will give you a good idea of what the next step should be. You can install it to a separate folder and put a blank mirc.ini file into that folder to avoid changing your other version's settings. If a new version works, then your issue was probably resolved in one of the versions since the one you're using and updating may be the only option. If the new version doesn't fix the problem, then we can look at other things.

Invision Support
#Invision on