"Everyone"? I don't use KTE. I've never even heard of it until now. Not to mention, there have been no reports about it so far, so I don't think this issue is as widespread as you make it seem. But yes, it's likely that script is incompatible with 7.x and needs to be updated.
mIRC tries to retain backward compatibility when it can, but AFAIK a bunch of bug fixes in RAW handling change the way /halt works in raw events which could lead to the issue. Most scripts will eventually break if they're not maintained. Tell the author to update the script for 7.x and it should be fine when mIRC goes out of beta. This is one of the reasons for having the beta in the first place.
