Joget DX 8 Stable Released
The stable release for Joget DX 8 is now available, with a focus on UX and Governance.
Try redoing the upgrade to v6 using this Upgrade Guide. You can actually upgrade straight to the latest Joget DX, see Joget v6 to DX Upgrade Notes.
I currently upgrade my Joget v5 Enterperise to Joget V6 Enterprise.
Never faced this issues while using v5.