The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
You can learn how to attach the debugger here:
https://forum.faforever.com/topic/3262/exception_access_violation-with-logs/2
Please do so - and report back with the full logs. You can upload them to www.pastebin.com to prevent cluttering your post.
