Cannot Restore Apps in Titanium Backup using Android 6.0

I'm having trouble restoring apps+data in Titanium Backup after flashing Android 6.0. I'm rooted (Supersu 2.50 plus modified boot.img provided by Chainfire).

When I restore the apps+data, the progess is stuck at 0%. I'm suspecting there's something wrong with my BusyBox, any thoughts?

Thanks