Verified answer

Yahoo is tweaking their upgrade

Try what works for me;

I have been hitting the back arrow on my browser and re-submitting a few times and that seems to work. When it didn't work ... I went to a different category answered there then went back.

And don't use the percentage symbol, it's an automatic 'coffee break' or 'breather'

Click on the (Breather Fixes) at the Top Yahoo Answers Answerer link at the top of this section's questions. She wrote them in her profile.

It's because of the updates there adding. It's causing more bugs until they get there scripts/coding fixed to the new updates.