sometimes when press f3+a and close f3 a and s still reload chunks. the only way to fix it is to close minecraft and reopen it.
Comments 3
Is this still a concern in the current Minecraft version 1.7.4 / Launcher version 1.3.8 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Is sticky keys (Windows function, unrelated to physical keyboard, may also be in other operating systems) on? the chunk reload is F3+a the texture/sound reload is F3+s, if sticky keys is on, the F3 button is stuck on, this may be the problem.
Debug screen wiki info: http://minecraft.gamepedia.com/F3