Just thought I'd elaborate a little bit. I've done some testing with a fresh install of OS4.1 Final. With that set up, I seem to have no issues running the more demanding applications like Dosbox, OWB and Timberwolf (rc1. rc3 wont run for some reason).
After applying Update 1 it's a whole different story. Aforementioned apps do not work at all. For example, Timberwolf (I was quite focussed getting it to work again) always crashes when loading. When this happens the OS4.1 logo appears (trough my indivsion) but its a lot dimmer than usual, for some reason. There is repetitive hard drive activity, but nothing is loading. OS4.1 never comes on. In such cases, I have to do another reboot to get back to OS4.1.
Since everything was finally running okay for me without Update 1, I went back to a clean install of 4.1 Final and am not going to bother with Update 1 until someone knows how to deal with the issues mentioned.
I do, ofcourse, appreciate the work that's gone into it.
Amiga 1200 Kickstart 3.1 (40.68), Elbox Power/Winner tower, BlizzardPPC 603e+ @240mhz & 060 @50mhz, 256MB 60ns, BlizzardvisionPPC, IDE-fix Express, IndivisionAGA, 120GB IDE, cd, dvd, Cocolino, Micronik Keycase, PCMCIA Ethernet