I was using a mod which allowed me to transform into a Flame Atronach, and for some reason it stopped working, I would attempt to transform but after casting the spell nothing would happen and a few mins later I would then take form randomly or gain the powers in my normal form then when the spell wears off end up turning in to the Flame Atronach.

I since deactivated it and have now just realized it's also happening when trying to use the beast form, all mods have been deactivated except Skyrim.ems and Update.esm and the problem still occurs.

Erm...help please

Everything works in a new game but nothing in my saves, I've rolled back to saves from shortly after leaving the tutorial dungeon and still not working and this is with no mods.

All I can say is test mods before you use them. The modding community is like black market medicine. Let the cat eat it first.

Well I've had 30hours of game play with no problem and it only happen with in the last 2 hours so taking it down to 28hours of game play with no problem and I do test mods and make sure I go through readmes and all comments but certain things you just won't know about until they happen..like this.

Last play through was on the 18th all was fine, then I was away and came back on the 23rd updated some mods I already had in my list and then bump into this. the only new mods added was Imps more complex needs, Duke Patrick new version of his combat mod and Sounds of Skyrim the Wilds...so how any of toughs could interfere with transformations I don't know...and even if that was the case rolling back to a save where I know everything was working properly and loading with no mods active surely it would then work but no it's still broken. On top of that when I start a new game with them same mods active and give myself Beast Form via console it works fine...if it was actually a mod am sure it would still be broken in a new game would it not..?