[QUESTION] [TC] 4.3.4 Custom Class Crashes on World Login

[Recycle]

Hey folks, again.

I've been thinking for the past few months to upgrade from 3.3.5a to 4.3.4 (on reason being I prefer the talent system) and been busting my ass for the past few days on this.
Note: I am fully aware that 4.3.4 isn't widely used because of it's not been researched/documented as well as 3.3.5a is. But this won't stop me, because I know it is possible to do what I am achieving to do.

So far, currently I've got the following stuff working:

Core Edits
Character Creation (although slightly buggy still, working on that)
Class-Level HP/MP combination data at least for the first level.

The primary issue I'm facing, and hoping someone to point me to the correct direction (because I want to learn, mostly) on how I could get around these pesky last few errors:

Upon entering world with a Custom Class, the game crashes.
I've attempted all possible steps to avoid this. I've modified the gt*.dbc files but I'm still experiencing crashes upon login (not upon opening Character view, but before I get the Intro video)

When adding talent tabs to custom class, every other class' Talent Frame becomes broken.
This happens on an existing class (in this case, Rogue)
http://i.imgur.com/9LI2w7k.png
http://i.imgur.com/TxhX5q0.png

At times, modifying gt*.dbc files causes me unable to open the frame on ANY class.
This one makes no sense to me. Currently, I have the gt*.dbc files modified for an extra class, but everytime I re-do it (despite knowing with 99% certainity that it is correct) it keeps bugging me that other characters' character panels are unopenable.

I'm still looking for solutions to it and there are a few places I haven't looked so I'm still working on that. But it won't hurt to try and ask.

I've been asking a lot around lately for problems I've had and received support. I think it's time I finally get the last annoyances fixed and soon make my first released content out to the world. Most of my work has previously been 3.3.5a but I believe once I fix this, it'll be a matter of days before I can get this out released.

For what it's worth, here's the crashlog - none of it makes sense to me what it's asking for.
http://i.imgur.com/5V7oYnt.png
And a pastebin from the WoWError executable:
http://pastebin.com/9kzzWEgB

Thanks for reading, and hopefully you can point me to a better direction!

[Ghaster]

Hmmm i had this problem aswell, but damn i can't remember how i fixed it.
I think it's something in the character frame? you know in cata it shows your class icon instead of your character? try looking into that.

[Recycle]

Hmmm i had this problem aswell, but damn i can't remember how i fixed it.
I think it's something in the character frame? you know in cata it shows your class icon instead of your character? try looking into that.

Would this issue be in even when you aren't opening the character tab? I'd imagine it crashing with the character tab but not when opening it.

I'll look into it though, thank you!