I am having a similar issue as well. I have followed the instructions in this thread [ROM][STABLE][Android 4.4.4] CyanogenMod 11 with 3.0.16 kernel [July 18, 2014]
. I have followed all the steps including doing a full wipe, flashed the ROM zip, gapps zip, and the aroma installer for the flash kernel several times with the same result. My screen keeps getting stuck on the white HTC loading screen.
Currently I have restored my phone to my previous ROM using a backup through 4ext recovery (v18.104.22.168 RC2). My HTC Sensation 4G T-mobile is unlocked and rooted with s-on. I have smartflash enabled on 4ext and my ROM is currently stock android 4.0.3. I did search the above mentioned thread for similar issues and a potential solution but none of the things I tried worked.
I would appreciate any help on how to fix this problem. If you need additional information I would be glad to provide it.