I was having issues with Engine 5.6 every time i tried to access the LogWindow, it happened after I activated Nanite on a bunch of models. Turned out to be because I had glass materials applied to these Nanites. the reason editor was crashing was the log was creating thousands of lines of log, creating a massive 1gb log file - I turned the nanite off for the objects with glass material and everything is fine again. Just thought I’d mention it here if it’s a known issue with the log - is there a way in the future to turn these types of log error off? i was only able to realise my issue by going into the SAVED log files for the project.