Timeline15

Well I'm an idiot. I hadn't actually run that version after adding it into .Minecraft. It appears in the launcher now, but the launcher just closes for a second then returns to the launcher screen instead of launching Minecraft. This may be due to the mods I have, so I'll try taking some out and seeing what that does, but if you think it might be something to do with forge, please let me know. EDIT: nvm, turns out it was something I did wrong with adding NEI.

Wait, are you trying to join vanilla servers, or servers that have the same mods installed as you? Cos vanilla ones wouldn't let you on if you had mods installed that are meant to be server-side. Generally, excluding client-side mods e.g. minimaps, you have to have exactly the same Minecraft as the server you're trying to join. As for the problems with single player worlds, I wouldn't know I'm afraid.

Hi all I recently downloaded forge 9.11.1.965 to run some 1.6.4 mods, and removed the newest forge too, just to be on the safe side. However, my launcher seems to still think I have the newest one. Using the old one with 1.6.4 doesn't even appear as an option in the "edit profile" menu. Only 1.7 has a forge option. I have tried creating a third profile on the launcher, and that didn't pick it up either. Is there a way to get my launcher to recognise that the older forge is there? I have already googled this issue, with no success, and have seen no similar threads on this forum. Any help is appreciated.