Sounds like you're using the Picasso IV still (only 4MB video RAM) - grab the UAE monitor driver from Amiga Forever (or create your own with Picasso 96 from Aminet - just install it all to RAM: not to your OS4.1 hard disk).
Once you've got that in Devs:Monitors change the RTG board to UAE Zorro III and add at least 32MB video RAM.
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