Mouser, did something change in your very last version with the new delayed search feature and/or the "stop search on exact regex match"? (I'm not sure which might be causing the problem)
I have an alias called "disable", which had a regex of ^disable (.*)? and it used to work well - I would type "dis", hit tab to complete and life was good (especially since the delayed search was implemented). Suddenly, now, as soon as I type "dis" the program starts searching (C:\Documents and Settings\All Users\Start Menu specifically, so it says in the status bar) for 3 or 4 seconds before it matches the alias. I changed the regex to ^(dis|disable) (.*)? to see if it would make any difference, but alas, no.
PS - is there any place I can download an old version of the program to test against? I was going to double-check what I said against 2.55.01 to see if something really changed with the version or if something is screwy with my system.