Spring 10 was released on my instance Friday, and my time-based workflows have been failing since.  I came in this morning to 300 emails stating which ones failed and an "Error Number" but no error message.  I have already opened a case, but it'll be days (and hundreds more records to fix) before Tier II gets back to me.  Anyone have any time-based workflows working who is using Spring 10 release?  Any SF Employee want to translate that error number into an error message for me please? Any ideas?

Email Subject: Salesforce.com workflow could not perform a pending action

Details:
Object Type: Opportunity
Record: XXXXXXXXXXXXXXXX-BS-121997

Workflow Rules attempted: Create Task: Follow Up or Adjust Close Date

Workflow Actions attempted: Follow Up or Adjust Close Date

Error Number: 1991919676-60 (1275087062)
Date: 8 Feb 2010 05:01:15 GMT