This spell does not seem to add fire damage to any weapon. My level 3 mage put this spell on 3 different weapons, and according to the log neither did fire damage.

it does deal fir edmage but its been severally reduced to like 1d4 or 1d3, what happens is the fire damage is calculated first then th physical damage unlike other systems where the fire and physical damage are calculated on the same line.

Everytime they hit you should see a message stating something like

Fighter deals 2 damage fire Fighter deals 12 damage physical

The number 2 and then 12 will appear over the targets head on strike.

Other systems would calculate it as

Fighter deals 12 damage physical 2 damage fire and thus the number 14 would appear.

I think it's done same as default nwn flame weapon spell, only limited to level 1. So it deals somewhere around 1d4+1 fire damage in the way described above. And the visual effect was removed.

No as an avid user of the spell I can tell you it works different than the nwn version. Check the "Mechanics changes" section in the information for new players forum for alist of all spell changes.

its 1d2+1 per 3 levels or so.

I'm going to lock this one, since it looks like it wasn't actually a bug?