Last time, i used TWRP 2.7 & 2.6 before update to 4.4.3. After updating to 4.4.3, i cannot flash ROMs by using TWRP. I tried latest 18.104.22.168 too but i have not luck. Backing up system is also very fast. It can finish in a few seconds. Last time, it took a few minutes to backup.
Edited: i can use philz touch and CWM to flash roms.