I had a problem and solved it :
all of my workflows hanf with status reason : Waitin For Resources
and Import Data didn't work.
I check my Organization in Deployment Manager and saw this: Status: failed
So I get a back up from my database and Delete Organization
Then Import Organization and use my back up
So : Status: Enabled
P.S:
you can cancel all of your jobs in Database with this query:
UPDATE AsyncOperationBase SET StateCode = 3 -- Completed
, StatusCode = 32 -- Canceled
, [Message] = 'WorkflowErrorPatched'
WHERE StatusCode = 20 -- In Progress
OR StatusCode = 0 -- Waiting For Resources
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