I seem to have the same problem updating Nintex Workflow again. The last time i thought it would occur only this single time but as i find now, I was wrong.
I just updated my Nintex Workflow 2013 from Version 220.127.116.11 to Version 18.104.22.168. Yes this is a big gap in Versions but this is not the source of the problem I think (because i had the same problem when i updated Nintex the last time and the Version gap was quite small). I used the nintex tutorial for updating Nintex Workflow so i also did an iisreset and reset the timer Service.
So what is the problem?
After the update I cannot continue running Workflows. Finishing a workflow task from a running workflow does not continue the workflow. When I then try to finish the task again SharePoint says that the task is locked by a running workflow (in ULS log). I tried activating the Workflow timer Job again and also the script suggested in the thread Task Lock - Task is locked by a running workflow and cannot be edited, but both Solutions didnt work for me. When I use the script the task gets unlocked and the next time I try to finish it there is no error concerning a locked task, but the workflow does still not continue... It seems the workflow does not get the information from the task being finished. Maybe ID problems!?
If I start a new workflow everything works like expected. I only have problems with the workflows that were running before the update.
Do you guys have any further suggestions/ideas? I would really appreciate it.
Thanks in advance!
Additional Information: I just had a look into the Nintex Workflow database and i found that there is no workflow Task in the dbo.WorkflowInstanceTasks table that corresponds to the workflow I try to continue. But I see the Task in my SahrePoint Task list and i can open and "action" the Task. Seems like the update deleted the Task or changed IDs so i cannot find the corresponding Task with the correct WorkflowInstanceId.