This has more to do with your tablet than Flash and #5. makes me think either your graphic card is going or you don't have enough memory to display what you're drawing. I draw at least 12 hours a day in Flash at least six days a week and never have these problems but then I have 24gb of memory installed and a 6 gb video card. What I'm saying is these aren't bugs so much as issues with your hardware. Maybe roll back your driver? Or it's just possible that your computer simply can't handle the vector calculations or that your tablet is too old to handle Flash. In any event I can't really agree this is an Adobe thing. Here's something I drew in Flash late last year and you can see my line is clean.
Thanks Mike! I love your drawing!
This is occurring on a machine at work, so who knows what the issue may be. It has 32gb of memory and an NVIDIA GeForce GTX 660 Ti 6gb graphic card, and the tablet is an Intuos Pro Small which was purchased brand new and updated to the latest drivers. I'll try rolling back the tablet drivers as you suggest and see if that fixes the problem and post the results.
Thanks for the kind comment on my drawing! :-)
I was also thinking that you might try the "Feel It" driver Wacom has because yeah with those specs it's definitely not a memory issue!