Dual Hotbars loads with my game but as soon as I load a world it crashes. I added advanced hud and it loaded the world with DHB installed but the second hb was not visible nor were the items in the second set of slots. I removed Advanced Hud and the game went back to crashing on world load.
In my resonant rise mainline world, I added dualhotbars. I changed the config to have four, however, sometime in game I swapped my hotbars. I know there is a keybinding to move stuff from one hotbar to another, but this is separate. In my inventory, whatever I put in the third row appears in the first in-world, and vice versa. The second and fourth rows seem to have no issue.
After a long break I'm finally back. Dual Hotbar has been updated to 1.10.2 and 1.11. It may be a bit buggy, I've tested it a bit myself and everything seems to be working, so if anything is wrong let me know (along with which version and what other mods you're using)
Updated to 1.10.2 and 1.11
The same jar works for both versions
Fixed middle clicking in creative using the extra slots
Fixed the rendering having one dark slot
Fixed bubbles being below where they should be
Fixed rendering with other mods such as AppleCore
Using Inventory Tweaks refill option will probably cause this to crash
While possible, it would take a lot more editing of base classes, which I'd say isn't worth it. Minecraft counts inventory slots like this; hotbar is 0-9, then the top row is 10-18, second row is 19-27, and the third row is 28-36. The mod simply allows the hotbar to extend from 0-18 instead of just 0-9. That means the top row is what shows up in the extra hotbar slots.
I tried this recently in 1.11.2 since I seemed to be running out of hotbar space (I blame Inventory pets mod because it requires the pets to be on your hotbar to work). I find that if I put the pets in the added hotbar they will not work but if I put them in the default hotbar they do. So with this I just keep pets in the default hotbar to get there perks then put my gear and crap in the hotbar added by this. I also found that this mod does not work will with the feeding helper in Zyin's HUD mod (allows you to eat a food item in your inventory without equipping it 1st). That being said I have not noticed any other problems with that mod or any other mods I use so far and you can just disable that feature in the options for Zyin's HUD easily enough.