MUI problems / OS 3.9 questions on a A4000T

[MozzerFan]

Regarding the MUI problem: There could be several causes.
Maybe the troubling applications use special mui classes that you must install first. Or maybe the screenmode you use is too small. It could be a missing library etc. etc.

As for workbench.library: The a4000T only used a special workbench.library with Os3.1. The a4000D and a1200 had workbench.library in ROM, but with the A4000T it couldn´t fit in rom, so with OS3.1 there was a special disk based version of workbench.library especially for the a4000t. With os3.5 and 3.9 all amigas use a diskbased version of workbench.library, so there is no special version anymore for the a4000t.

[MozzerFan]

Well if it didn't boot even from floppy there must be some other problem. If you get your system to run 3.1 again, you can try a clean install of 3.9. I'm 100% sure there is no special version of 3.9 for the a4000T. If you're afraid that the romupdate will choke your 4000t then don't install it. IIRC during installation you're asked if you want to install the romupdate or not. Be sure to make a backup of uyour current config though.