After reading your post I tried the /saveini and it worked once then reverted to default. nothing in the mirc directory or its subs have readonly attribs and there aren't any other accounts on this computer to deny permissions to or be denied by.
I did find out that it's an invision problem after all. their addon alters or sets a forced reset in NickListCLR in ialias2.mrc line 350. I've modified it a bit and hope that does what I need it to do.
Thanks, and I'll let you know if it works.
