I have fixed a bug that was apparently causing a memory leak. This has now been fixed.
However, when fixing this I came across another issue with the name colour gui not loading the colours correctly when using the command sometimes.To resolve this issue, i had to remove the no permission lore messages that would appear if a player has no permission to use a specific colour.
The colour will still be denied if they don't have the permission to use it, it just won't show the no permission lore messages on the item in the menu now. I may add this back in a future update but for now, i had to remove it.