I'm not entirely certain what section is best to post this in, but since I'm playing modded, I'm posting it here first, and it can be moved if appropriate.
I've occassionally gotten a popup display about a Realms 404 error (like the attached) shortly after entering a single-player world, which makes no sense to me - if I'm in single-player, how can Realms 404ing affect me?
Ugh. Several problems with that suggestion:
1. It seems rather drastic to deal with a problem that only occasionally happens.
2. I'm using MultiMC rather than the default launcher, so I'm not sure what the equivalent of reinstalling Minecraft would be - delete the dat and jar files from the versions folder?
3. Even if it works (which could take a while to be sure of), it wouldn't explain why the problem was happening.
I have never played in the Realms, or on any server for that matter. I have only played single-player, since shortly after 1.7.10 came out. (technically I bought the game about a month before 1.7.10 came out, but I didn't start playing it significantly until after)