This is a minor bug.
I did /LIST on one of the networks I'm on (It's the one I'm scripting). It wouldn't fill, and stop doesn't work, nor could I close the window.
So I ended up disconnecting - which worked.
However, the list that was created in the mIRC directory was locked by the .exe meaning it couldn't be deleted without restarting mIRC.
Whether it was still trying to fill the list at that point is a guess.
Basically: if disconnect from network(during a list)->stop and free lock
