Part way through level 27, and all of a sudden my spell graphics disappeared...

The effects are still happening, such as healing actually healing and light actually shining, but no golden whirlygig for healing or globe of light for candlelight...none of the other spell effect graphics are happening either.

Any suggestions as to how to fix?

Has anyone else had this happen?

I had some issues with graphics, missing spider webs, flame spells, etc. The ENBseries patch helped out with that.
If you're on PC, I suggest it to you.
http://enbdev.com/download_en.htm

Thanks muchly, I'll check it out.