It is a bit hard to describe, but b7 broke at least the game Hyperdrive for me.
In b6, A1200 fastest possible low latency vsync, the game runs perfectly.
In b7 the player space ship sprites flickers and moves much more jerkily and flickery. Happens both in Direct3D and Directdraw modes.
Config and log files attached.
Since the graphical effect is hard to describe, I uploaded movies of the flickery b7 gameplay here:
www.coolatoms.org/output.avi (~6 MB)
And a movie of the 100% correct b6 gameplay here:
www.coolatoms.org/output_b6.avi (~6 MB)
I think I have also seen other occurences of flickering in beta 7 during regular WB usage and screen flipping etc but that seems harder to reproduce.