You need to flash a 2.22.xxx.x firmware which is needed for a 4.4.3 ROM to run properly.
Check this guide on how-to : http://forum.xda-developers.com/htc-...s-off-t2800727
Thank you all for your help and most appreciated. .
I will be more careful when flashing as I did not know the difference between Sense roms and GPE roms etc