There's not enough information in the post to investigate the cause of the issue. Can you open a support ticket so we can take a closer look? You can post the ticket number here and we'll update this thread with the outcome.
Also a error in roundcube after logging in that says An error occurred! server error (error!)
I was wondering if you had the same issue and if so if your issue had been solved?
this seems to only be happening in chrome, even when clearing all history, cookies, everything etc for all time I'm still seeing this happen across multiple accounts, from different PC's, it's very strange.