I have been using a local galaxy instance successfully for some time. However, suddenly galaxy will no longer run jobs. It will add them to the queue, but they never start running. Additionally, when I try to run workflows, it says they are successfully invoked, but it does not add the jobs to my history. After searching for answers, I updated the galaxy instance to 18.05 following instructions on galaxyproject.org, however this did not solve the issue. I appreciate any advice on this problem.