U.e. 4.20 freezes when launching

Hi

Updated to UE 4.20 Studio and now I cannot launch the editor at all. It simply freezes my entire computer so that my only option is to switch the power off. I can’t even open Task Manager to try resolve.
EDIT - No error messages either.

Hello,

We’ve recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.

https://epicsupport.force.com/unrealengine/s/

Thanks