If anyone could help on this you'd make a very happy catwolf. So here's what went down, I tried to open MC and it kept crashing so I took out all the resource packs from the folder, started it and then put them back into it. When I tried to put the resource packs back on, it stopped responding for a couple seconds then put me back to the title, still in default textures and the resource pack I tried enabling would be back on the left hand side. (I don't know if it effects anything, but I have a modded client, 1.7.10) Any advice would be appreciated ('cos I can't live without mah DokuCraft!)
There might be a problem with one of the packs. Put them in one at a time to see which one could be causing it. Re-download that pack. That is all I could think of. Have you changed your setting recently (added any mods)?