A few people reported this problem recently, I am not experiancing any issues with displayment of ads but not to worry chances are if others have this problem it is a bug with Yahoo or they are running low on inventory. Try a different ad size or targeting group.
next time try logging into your account as well....if they suspend you they should let you know via message or email, and your money would probably go to 0$ as well...just a guess though.
has anyone been suspended that could let everyone know if they are emailed or if it says they are in there account?
when i was suspended i noticed blank spaces where my ads were and shortly after got an email from them.
yes, fix the problems they dont tell you exactly to fix, at least they give you the pages that are in violation, then email them back and wait for them to re-review your page. the ads will come back shortly after they re-review. it took them 6 days i think to get me back going. another time they got me back up the same day, within a couple hours.