Wand and sword won't cast spells or switch to spell mode while standing on redstone ore.

Did you mean redstone wire, or actual ore?

Hm, nevermind you did mean ore.. how weird. Seems like standing on redstone ore fires off constant interact events.. I bet I need to filter them out.

Should be fixed in latest dev build. This was also breaking wands when standing on pressure plates.

Yep, it's fixed.