Drying Speed bug that is great fun:
Dial Fluidity up to 100%
Dial Drying speed up to 100%
Make a fat blue splotch on the left screen side
Take bright yellow and make a fast stroke with it from the left to the center.
Turn drying OFF.
Watch the pattern-party until you're happy and turn Drying back on.
Turn drying speed down to less than 75%.
Turn Fluidity down to 0% or so...temporarily.
(You can make a new layer and stay on it for your next drying on/off experiments. That way you can't ruin the beautiful pattern you've just created!
Now you should be able to just continue as if nothing had happened...
But you have things like this: