My caster (who is at the same time the main character) is a Mage, he's got both Cloudkill and Sunfire memorized, and in case of Cloudkill - i used the spell first during the original BG campaign, somewhere in the Dragon's Run, while doing a quest from Dark Side of the Sword Coast story. The Mage was 9-th level at that time, the animation started as usual, but to no avail: nothing happened. I tried re-using the spell in several other locations, then finished the original story and went on to the Shadows of Amn, tried using it there after getting the 11-th level, too - sadly, without any success. The first Cloudkill wand i got was the one from Irenicus' laboratory, and when i checked if it works, the cloud actually appeared and did its thing.
The Sunfire does exactly the same. Had a chance to try it when my Mage got the 11-th level. I memorized it, approached the enemies, started casting, and the animation is all i saw. I remember playing BGII without add-ons and mods earlier, and most certainly, i never encountered such a problem. Well, wouldn't bother me too much, because BGT is still awesome, but those two spells are in the list of my favourites, so i desperately need your help.
Attached Weidu.log to the post. Though if you need me to do something particular in the game and then re-attach a new log, please, tell so. Probably it would be better if i launched the game, tried both spells, then closed it and gave you a new log?
Thank you for attention and help.
P.S. Played some more and found out that Burning Hands don't work, too.