I'm currently getting a lot of stales. Known issue?
What are you calling 'a lot'? global rate for past ~day is around 3.5%, which is certainly higher than normal, but not ridiculously high.
I think it's likely due to the problem user my previous post describes.
Well, I'm using Smartcoin and it was failing over to a different pool due to stales/rejected being above 10%. I can't say for sure what the numbers were. I will try again.
Edit: Just mined for a little over 20 minutes and got this:
Grand Total : [1049.11 MHash/sec] [308 Accepted] [35 Rejected] [11.363% Rejected]