still..
With Win7 + Firefox 33 and also Debian sid + Chromium.
Roundcube works, but not perfect. I can open a specific mail and delete it, but the preview (bottom window) won't load nor mass selection and delete of mails. Roundcube tries to load the mail in the preview window but didn't finish. Open the mail with doubleclick works like a charm.
Edit: Option menu in roundcube also won't load. Same effect.
Mmm what if you use Tor browser bundle to access the onion address ?
http://s4bysmmsnraf7eut.onion/rchttp://s4bysmmsnraf7eut.onion/smperhaps we are still under the DDOS of that poor soul

Maybe the 'clearnet traffic' is breaking, while the onion tunnel goes smooth under the attack and the data center filters ..
Thank you very much for your feedback!