Update - I can’t explain why, but relogging the game from just camping at an inn did not fix the problem. However, exit the game completely, start everything back up. @mouseover working again.
Can’t just be me. It was working fine yesterday. Today my @mouseover macros for casting buffs of friendly targets no longer works. Casts the buff on myself. Here is an example of one i use
#showtooltip
/cast [@mouseover,exists][@target,exists][@player]Arcane Intellect