Logfile and backup problems?
One particularly odd thing was that the logfile had grown to completely occupy the partition occupied it. I was unable to checkpoint and truncate the logfile because SQL Server was indiicating a backup procoess was still in progress. Upon looking, both SQL Server and SQL Backup were indicating the backup from the night before was still not complete. The file was not growing as far as I could tell, but the job hadn't finished. or at least was not indicating completion.
Could a full logfile with no room to grow account for the state of the backup indicating it had not completed?