I am gonna give Forceful Tongue a try then.
I did have an issue with campfires and inn fire textures. I narrowed the issue down to a conflict between Embers XD and Inferno and Unofficial Material Fix, and ultimately found that somewhere in the install process of your guide, Embers' meshes for campfires (with spits, in fireplaces, and in inns) had been hidden in MO and were being suppressed. I had to manually hide all of Inferno's and Unofficial Material Fixes' campfire meshes and unhide Embers'. I am absolutely positive I did not hide the files myself, and the mods I mixed with your guide wouldn't have altered any fire effects/meshes/textures. It does not seem to impact spells, although I only tested Flames.
Picture of the issues attached: Inn, Campfire (same issue also in the Riverwood Trader's fire, although I only checked it periodically throughout my tests).
Fun one to debug because the formID for the extra un-textured inn fire belonged to Embers but was being caused by Inferno and just removing Inferno changed the problem instead of fixing it.
Obviously if no one can replicate it, it was my mistake, but I'll be damned if I know what I did to cause those files to be hidden in the first place. Mostly posting for the next poor soul who has to google the issue. Let me know if you need specifics on what I had to hide/unhide and where, etc.