Wanted to go through and delete some ads from a group of comics. Went to Page view, opened first comic, deleted pages, but had to keep going back and forth to Library tab to go to next comic because Next Comic (ALT+SHIFT+N nor Read -> Next Comic) does not work from that tab.

Can report I have this bug as well. It broke a good while back. Used to use the page view to sort through comic to delete or label pages correctly, but the Next and Previous functions no longer work.

While browsing through a series today, I think I stumbled partially across the reason for this. I was browsing a series in a stack, then closed the stack, got to the end of the book I was on and it didn't advance to the next comic. Had to reopen the stack so the reader had a list to pick from.

I'm guessing the Pages tab is kind of doing this as well. It looks for a list, but since you are on the pages tab, it doesn't see one other than the currently open comic of course.

My partial solution for this as of late had been opening up several of the comics I intend to work on in a row in new tabs, then tab through the comics as I work.

Yep, Next Comic works only if the List of currently opened file is selected in browser. So when you change to different list or other stack Next Comic won't do anything. Same goes for tabs - Pages and Folders.