But the sample project (Infiltrator) starts normally…link text
Doesn’t look to be related to the launcher.
Perhaps a stack overflow while trying to load a piece of your content.
MAP LOAD FILE="…/…/…/…/…/…/Users/1/Documents/Unreal Projects/GssTrainer 4.9/Content/GSSAssets/Levels/MainLevel.umap"
Probably this map? Do you perhaps have an older version of the map which you can try to load?
I just successfully finished current work in evening and made usual backup.
Next morning the launcher started with update. Then I cannot open the project because of editor crash.
One of the older version of project was opened. Then I had replace old assets one by one restoring broken links and nodes.
Problem is solved, but such surprises shake my patience noticeably…