I just typed in a nice long review on EasyChair. Yes, I prefer doing this with the online form when I'm just sitting around and have time to do a review.
Apparently I didn't hit one of the score buttons (although I'm pretty sure I did, let's give EasyChair the benefit of the doubt there) so EasyChair says there's an error and, of course, forgets my nice long typed review when it takes me back to the review page, so I'll get to re-do and re-type it later.
Sigh. I guess I'll go back to doing my reviews in a text file and cutting and pasting. No, this has not happened to me in recent memory in HotCRP. Put this down as one more reason (but not the only one) why I don't like EasyChair and would prefer a better designed system (like HotCRP...).