B) The client was never finished.
C) Sometimes it just decides to stop working. I've seen this happen on two different OSes - Win98SE and Win2k. One day, it works fine, the next, no matter what you try, short of formatting, it doesn't work. Period.
D) Sometimes when you close it, the task isn't killed, and you have to dick around in task manager.
I, personally, -hate- it. Can't stand it.
ZMud is the most full featured client avalible. It's also not free, and has no features useful on SD which Pueblo does not have. If you want to script/map/trigger on a MUD, there is no substutite. But that's not allowed on SD...
I suggest going with whatever makes you happiest. For me, that's VMOO, but that's because of the MOO Integrated Development Environment features which I require as a developer. As a non-developer, VMOO would probablly be about the same as Pueblo... maybe a bit more stable.
-Kevlar