In the frequentUpdate function(s) you are trying to forward and check 'self.Power|Health.unit' instead of 'self.unit', thus making the update functions hang up (especially on vehicles and pets).

Also, if swapping and not using frequentUpdates it also hangs up the power/health bars (missing event update perhaps)

Just found out by testing it on vehicles in Ulduar (swap from one seat to another)

Simple diff that fixed the frequentUpdates issue for me
http://pastey.net/132773-4clr:132772-g5rf

Unable to reproduce.

Also your diff isn't a diff, it's just a visual representation of a difference.

Same issue in Lily too (note that its in 1.4, as the title says)

Doesn't change anything as I was unable to reproduce it with both 1.4 and 1.3.27.