Good day.
This incompatibility stems from the way I coded it to auto-remove an offhand item if you equip a two-handed weapon. Because I overwrote a function, it ignores any other changes made to that function before my plugin loads. After looking at my own code, there is probably a much better way to do this same thing, but I was pretty inexperienced when I initially made the menu things for this plugin, so I wasn't able to come up with anything better at the time.
I should be able to patch it, and possibly get the thing you're having issue with working again. However, you might also try adjusting the plugin load order so that the VS plugins load after mine instead. It'd pretty unlikely that they overwrote such an important function, so they would've ended up building off the original, meaning my changes should still be left intact.
Give that a try and see if it works, and if not I'll see if I can cook something up to fix it.
~Ramza