Once upon a time, Citidel downloaded Visual Studio for things completely unrelated to this issue. Citidel then noticed he could open the mdmp files himself, so he did. And he saw this: "The thread tried to read from or write to a virtual address for which it does not have the appropriate access". Thinking this fairly self explanatory, Citidel began always launching Arma 3 in admin mode and has had no problems since.

That mdmp file I gave the link to is for it.

The issue got worse on 1.14. Before there was one server I could join with no issues, now even that won't work.

Couldn't upload the mdmp file to here, so heres a link to it.
https://mega.co.nz/#!LhgCkJ6b!GU5ufTCPj4bKVl-TtzyWokrW_KinOU1F_6ErraBDPs4
Also, the mdmp and bdmp files for that first .rpt file were deleted, so just ignore it and use the second .rpt file I uploaded. It's the same crash.

Please don't just ignore this issue. You, reader probably don't think much of it because it doesn't afflict you. How would you feel if you had a massive issue causing you to reinstall the game everytime you wanted to join a server and everyone else just ignored the issue because they didn't have it.