Appears to be fixed (kind of) in 15w38a.
The text box now displays what it's supposed to. Commands also work.
Log (Pastebin) from latest.log (is same that was displayed in GUI). Showing server start, error message that was thrown, test if commands work ("say test") and server shutdown (with "stop").
This (for me) appears to be fixed in 1.8.2 pre 1.
However, when spawning invulnerable moving fireballs, it does not move smoothly, but little by little (I don't know a better word to describe it).
Example:
/summon Fireball ~ ~-2 ~ {ExplosionPower:1,direction:[0.0,-0.2,0.0],Invulnerable:1}
Should I report it as a new bug or only modify this report?
Updated affected version and the commands to reproduce, with explanation of what the fireball does when summoned with the command
Can Confirm, /difficulty seems to do nothing at all.
I searched "/spawnpoint" but didn't scroll all the way down since I thought the only affected version was 1.7
Sorry for posting a duplicate.
Can't replicate with Dxtory 2.0.123 Trial
Unrelated to this issue. Take a look at MC-115797 instead.