Long time user, just upgrading ZD Client from 7.0 to 7.1.1 Beta. I do not use ZCS but just have the client synching with various webmail accounts. (Yahoo,GMX, Webmail)
Have an issue with the client in that sometimes it just stops synching even when you click the send/receive button, nothing happens. Usually I just restart the app and everything works again. This is a bit annoying and wondered if it was a known issue. It is probably stuck doing some other process but don't know if there is a way to identify this.
I have had this happen when I know there is mail to be downloaded so it's not just that it happens really fast so no visual signs.