Windows 10 x64
Java 8 Update 73 (64 Bit)
Forge version 11.14.3.1521 (the only version of forge I could find that doesn't crash on multiplayer servers)
Shaders mod installed (but not in use while in replay mode)
Sometimes, after playing on a server, when I quit, the replay does not save. I check in the folder and see a .tmcpr file. I have searched through forums,https://www.replaymod.com/forum/thread/1064 , and have found that other people have had similar problems. I find that for me, it is around a 50/50 chance that the reply will be properly saved. This forum, https://www.replaymod.com/forum/thread/1059 gives a temporary fix although replays that I have converted show no time or length of the replay in the top timeline bar.