Cata: 4.4.1.57294
Skillet: 2.02

Opening Skillet triggers these 3 errors simultaneously - error logs attached.

1x Blizzard_SharedXMLBase/ProxyUtil.lua:109: C stack overflow
2x Blizzard_Menu/MenuTemplates.lua:21: C stack overflow
7x C stack overflow

tradeskillupdate.txt
proxyutil.txt
menutemplates.txt

I get those same errors even when I disable ALL addons (including Skillet-Classic). I believe this is a Blizzard bug.

It only does it for me with Skillet enabled. Disabled using blizz ui no errors.

There's no "fingerprints" in the files you sent that point to Skillet-Classic and I have similar errors when I delete (rename) my entire ...\Interface\AddOns folder. I've gone as far as deleting the entire ...\World of Warcraft\_classic_ folder and reinstalling and I still get these errors.

I'm sorry you are having problems as I hate to lose a Skillet-Classic user but there is nothing I can do for you at this time.

Finally got a reply from QA today on blizz forums.
https://us.forums.blizzard.com/en/wow/t/blizzard-ui-trade-skill-errors/2003934/5

"this is a known issue that’s being worked on."

Thanks for the update and the pointer. I tried to report this but never got a reply.