It was working before the upgrade and once I switch It stopped but at the same time but can cancel the slicing. I waited 30-mins to see if anything would happen and nothing. I don't even get hit with a can't slice message. The log of the slicing from the cura.log file is below
2019-06-26 18:32:03,953 - DEBUG - [MainThread] CuraEngineBackend.CuraEngineBackend.slice : Starting to slice...
2019-06-26 18:32:03,954 - DEBUG - [MainThread] CuraEngineBackend.CuraEngineBackend.slice : Going to slice build plate !
2019-06-26 18:32:03,959 - DEBUG - [MainThread] UM.Backend.Backend._creat