This still seems to be a problem in Classic.
Up until now, I have just been using the arrow buttons in the default UI to switch between bar 1 (my solo/pvp/dps bar) and bar2 (my healing bar) and it’s no biggie… But I just recently installed Bartender4 and when you remove the ‘Blizzard Art’ bar, it also gets rid of the arrows.
So, shift+mwheel-up and shift+mwheel-down don’t work for switching between bar1 and bar2 (nor does shift+uparrow/downarrow). I also tried binding them to completely different keys and still no joy. The keybinds are set in the keybind section to both (mwheel and arrows) but it’s just not actially working. Even with Bartender disabled and back to the defaul UI, it still isn’t working.
I like Bartender a lot, gives me much more screen space and lets me arrange things how I like. But I need to be able to switch the main action bar between 1 and 2. Any ideas?