I recently upgrade my Sharepoint foundation 2010 to Sharepoint 2013. It was successful. But after this, I am not able to start my old workflows. In addition, if i create a new list and a new 2010 workflow, I am not able to start them as well. The button to "start workflow" just does not do anything. Afterwards the error that gets logged into the workflow history is userid->system account and
Failed to start(retrying)
what might be the cause?