Skillet UI does not open for Jewel Crafting, works fine for Enchanting.

I'm not sure what the problem is, but it works for me:

To start, verify that the issue still exists when all other addons have been disabled. If that fixes the issue, then enable your other addons a few at a time (I use a binary algorithm, half at a time, then a quarter, etc.). If it fails when Skillet-Classic is the only addon, I will need your global saved variables file, Skillet-Classic.lua, and we may need to enable Skillet-Classic's debugging.

GitHub won't allow files with a .lua attachment to be uploaded so either zip it first, or add a .txt extension.

If I open it through enchanting then click on JC button at top of skillet window JC window opens. If I try and open JC from actionbar, the blizzard window opens. Will try with all addons disabled.

Are you using the "shift" key when you click the action button for JC? If so, type "/skillet nomodkeys" and that should fix it.

I am using a macro as follows:

#showtooltip
/use [nomod]Disenchant
/use [mod:alt]Prospecting
/use [mod:ctrl]Enchanting
/use [mod:shift]Jewelcrafting

So yes I am indeed using the shift key to open skillet for JCing. Trying your suggestion right now. Worked Perfectly, ty.