So the error I get is
"Web Socket error ConcurrentModificationException"
Error Communicating with Lobby
I just updated to 2.6.14759 and am still getting the issue sometimes on login.
I'm not able to access or see the console window that I've sometimes seen in the past with error messages, maybe cuz I'm not in a game when this happens, I dunno, or maybe due to my installation on this computer being setup different.
The error I'm getting may be the same one logged by the builderbot here, hard to say.
https://github.com/triplea-game/triplea/issues/12613
If I try sending a message when I get the websocket error on login, I cannot and it says
"Failed to send text IOException: Output closed"
which matches what's in that listed issue.
I don't have any of the special testing settings enabled (eg the websocket beta one under settings - testing).
If other people aren't getting it, then it just won't be that important and we'll figure out why my system is having it, still not sure who else is using 2.6.x stuff and if anyone is gettin this issue, losing track of the prior discussion.