I had the same problem described earlier in this thread

Could not connect to SQL DB: Can\'t connect to local MySQL server through socket \'/var/run/mysqld/mysqld.sock\' (2)

I emailed SwissDisk and they said they were fixing problems which would take 2-3 hours. It's been 12 hours now and still not working so have switched to myDisk.se as johan suggested, and it seems to be faster as uscmeche suggested. Thanks to both of you for the tips :)