Brave crashes 20 seconds after starting after new windows 10 update applied

@kelskamp,
Thanks for reaching out to us. Two things I would like you to try first (good job checking the Sync command line flag):

  1. Try disabling Hardware Acceleration – if you cannot make it to the menu fast enough (Menu --> Advanced --> System --> Hardware Acceleration), use the following solution found in this thread here and see if you can launch the browser this way: Error on yesterday's update [Windows "blank window" issue]
  2. If this doesn’t work, it may be a certain extension you have installed causing the crash. You can test against this by launching a Private browsing window and/or creating a new browsing profile (Menu --> Create new profile) with no data in it and see if you get the same results.