Nah, no mods.
I think there's some in the mods folder but I don't really remember them and none are loaded.
If we're talking the Spellsword's spell effect, yes? I've toggled selecting spell on and off and made both physical skill and basic melee attacks.
But if we're talking following up a single target spell with a basic melee attack, I haven't seen something to activate.
Does the back/front row position matter for melee more than I'm aware? Since the Spellsword's range is always melee now it might be it messed with something in a way I didn't consider.
For the Arcane Blade buff lingering through Oblivion I haven't tried yet, but I'm sure retoggling the element in the next battle MC is in should override/undo it. Those things seem to persist outside combat, so it's probably just that the game didn't account for losing the ability while it's active.
How do people usually share the save file? Thing was too big to fit a free pastebin. Do folks just paste it as a post here?
PS : As a side note, sometimes trying to open the console and untick Hide Errors to take a look kinda freezes the game. Is the stuff that would be written to console pushed to a log file that'd be easier to look at/share?