Default [Q] TWRP and CWM won't work...

Whenever I flash TWRP with the AIO Toolkit from Hasoon2000, TWRP recovery will load, but the internal SD (/data/media) is blank. The files are there when it boots to the system, but they're not showing up in TWRP. CWM won't boot at all when flashed (it just goes to back to fastboot). I tried flashing the generic TWRP in the AIO Toolkit and the Sprint version, both seem to behave the same. Also if I try to flash a ROM, it always fails (CM fails immediately, Viper installs then says failed, InsertCoin says it succeeded, but then it never boots). I tried flashing TWRP 2.7.1.0 as downloaded from the TWRP website and it won't flash ("BootMagic failed" error). And GooManager doesn't find the right file to flash for my M8. Does anyone know how to fix this? I like the stock ROM alright, but I want to try some others. Oh, also when I try to do a backup it fails, saying it can't mount /data/media.