The darkness bug as we all know exists on Arelith.
If you go into darkness (or have it cast upon you) with ultravision on, and then step out of it and someone dispels your ultravision...
The Darkness will persist on you even if you rest/dispel yourself, you basically have to log out to become normal again.
Would it be possible to just give Darkness domain clerics "Perma ultravision" since the only thing that spell is used for is infact "Darkness".