I've run into this problem in Max 2010, wonder if anyone has a fix.
I'm unable to access map channel 2 in the UV editor. Switching to map channel 2, as circled in red, does nothing. In previous versions I get a pop-up asking if I want to perform this operation, then everything works as intended.
Replies
not sure what drove them but way to many people including myself stumbled upon this and didn't knew further until after asking here or someone.
In TexTools I wrote a function that opens and closes the UV editor and makes the correct preparations in order to edit the specific channel - because it was way to confusing for me when working with multiple channels.
i expect it can be chalked in as user error, but im sure i lost some work. bah humbug.
*obviously not