Minecraft Version: 1.12.2
Forge Version: forge-14.23.5.2854 (latest provided by the twitch launcher)
Cosmetic Armor Reworked Build: 1.12.2-v5 or 1.12.2-v5a or 1.12.2-v4b (tested all)
Other Notes: Tested on single player without other mods, and single player with other mods. Tested on a server with mods. Same result for all.

Issue: After pressing the rainbow icon to open the Cosmetic Armor Tab, the tab does open and I can see the cosmetic slots BUT my inventory becomes unresponsive and I cannot pick up or move items with my mouse. Closing and re-opening inventory makes it responsive again, but the issue persists every time I try to open the Cosmetic Armor Tab.

hi my swords are not showing in the game how can i fix

The issue also occurs on forge 2847 with CaR version 5a
My OS is Windows 10 Home, version 1903, OS build 18362.778

I have just tested it with baubles, the bauble gui opens fine and I am able to use my inventory while the baubles gui is open. I can test more mods if you have any recommendations!

Can you try re-downloading the mod file? or using the one from here.
Also, can you provide the log file located in logs folder?

Pastebin of log from the version downloaded from curse: https://pastebin.com/BcytwkAD

Pastebin of the log from the version download from your link above: https://pastebin.com/GjYsTyg3

Hey, even if its not able to be fixed I wanted to thank you for taking the time to look at my issue. I really appreciate it!!

I'm sorry i couldn't fix your issue as i couldn't reproduce this and there aren't any useful information in your log files.

Hey, it happens. Once again, thank you so much for your time!
I'll ask my friends to see if anyone can re-create this issue to see if we can get any more useful info.

I would like to help, but i couldn't reproduce this...
Which java version and game launcher are you using?

I am using the twitch launcher, aaand...
Java 8 Update 251 (64-bit)

Does this only happen on my mod's gui? or does this also happen on other mods' gui?
Also, what operating system are you using?
Does this also happen on forge 2847 ?

Hey so, here is an embarrassing solution to this problem!
For some reason, this only happens when I play in window mode! I like to play in window mode, so when I was messing around with it again and I tried it in fullscreen, well. It worked perfectly fine....
Hopefully this thread will help anyone who has the same problem in the future.