Here is a great tool that came to my attention recently from Zero2Ten, http://www.zero2ten.com/blog/ms-dynamics-crm-2011-bulk-workflow-execution-tool/. If you need to run a workflow on large numbers of records then this is the tool for you. No more running a workflow 250 records at a time.
The tool runs outside of CRM as a client side program.
In what seems to be an unusal move, Microsoft has released a critical update for systems stuck on Update Rollup 11. The release article states that the update is (the emphasis is mine):
If you have installed later update rollups then you do not need to install this critical update.
I had to investigate a client’s on-premise installation (with UR13). The reported problem was random running workflows disappearing.
The client has an on-demand workflow against leads which includes several time waits and record creation (such as send e-mail) actions. For many leads, the workflow starts, creates records and then disappears. There is no system job record for the workflow. It is as if someone cancelled the workflow and then deleted the system job.