Hi Joe,
There are some SAP notes out there with the same error messages and most of them relate to fixes being adressed in PCM 10 SP04
http://service.sap.com/sap/support/notes/1750787
http://service.sap.com/sap/support/notes/1475016
http://service.sap.com/sap/support/notes/1617866
but since you state your build nr. is 704, you must already be on PCM 10.0 SP05?
The below SAP note suggests checking the available (temp) tablespace in SQL server. Your dba should be able to do this for you.
http://service.sap.com/sap/support/notes/1278884
In addition, I would suggest checking the license keys, maybe they expired and multi-user login is not possible anymore.