Yes & no. Yes it bothers me but not enough that I can't live with it. I just asked if there was a way to stop it. I've read through the thread provided above, apparently there's nothing I can do about it so I am not worried about it but thanks for asking
As an aside I do love the program. Before I was having to unzip the epub after calibre and make whatever fixes, zip it back up, rename it etc. Even made a donation. I also like the fact there is no huge donation button, that doesn't go away even after you've donated... *cough*calibre*cough*
So to sum up, it's just a minor annoyance. I asked a question, got an answer.