This last week we started seeing problems in ADITI. Or at least I just started hearing about them and running into them myself.
BUG-762 – I lost de uploads mesh and all lindens in aditi grid. – 13/Nov/12
Maestro Linden says some of the ADITI problems were due to a hard disk filling up. That supposedly has been taken care of. But, I am still having problems logging in or doing much of anything on ADITI.
If you are seeing these problems, file a JIRA and reference the JIRA item that is most similar to what you experienced.