I've got the same problem. cannot get round it or figure out what is causing this on the client. No taskqueue processes running. It starts and then stops. Any help for this please ?
Did you try to launch the task from the targeted computer.
To do that, copy the ldprovision folder from the cote server. copy \\[CoreServerName]\ldlogon\provisioning\windows C:\ldprovision
Then run the ldprovision.exe in this folder.
You will be prompted to your login and password...
Then I think your provisionning will fail but you will have a log file in ldprovision folder and I think you could find your failing issue.
Hope it can help.