Sorry about that. I had disabled the blitter when experimenting with solutions to the TVPAINT graphics corruption and forgotten to switch it back. But the problem pre-dates me switching off the blitter.
I re-enstated that blitter and re-ran the tests:
I tried the beta version 2.4.2b2, with Direct3d enabled and the RTG_blitter_0 parameter specified from the command line.
Unfortuanately, I still got graphics corruption with that single brush in TV-PAINT. I'm wondering if it's even a WinUAE problem, or perhaps another Picasso96 conflict. Wierd it only happens with that particular brush.
Logfile from this session is attached:
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