From time to time, some of my SP2010 site workflows fail with this message:
This task is currently locked by a running workflow and cannot be edited
I believed I have fixed this but from time to time I still get the error.
There is nothing in the logs as to a reason of why this happens. It fails sporadically and I was unable to find a pattern (fails on different tasks, for different users with different access rights, workflow shows as "In progress" etc).
I tried everything I could think of and still nothing. I'm running out of ideas...
How would you approach this situation?