Once I tried to send a large attachment and the email stuck in my outbox. Finally I found out that my attachment is too large and the email client doesn't inform anything about it. I think the email client lack some progress indicator for sending email (especially when sending large email). Other than that, quite a nice experience!
If you would like me to check logs, I am happy to do that, but I do not know where they are. And please note that David Boreman at Nuevasync.com knows about this issue and I am in active communication with him trying to troubleshoot the N9's syncing on their servers.
After PR1.1 my gmail (the Google account) stopped syncing. I have tried to disable the account and start using it again. Didn't help. Any ideas what to try next?