Hi Joel,
I have seen the same error message come up at times. I did not always get it - but see it more frequently now.....I think! I use Astroart 5.0 and use ARTEMISHSC as the camera choice. (I have the 460EX).It has been a while since I was out with the scope - will watch this more closely.....but like you, I don't think it affected anything except my sense of calm :-)
If you have figured this out - or if anyone can shed any light on this.....would love to know.
(Software loaded from the disc that came with the camera - on Windows Vista).