Nagging warning, now continual

[bwood]

In the past, every time I've published changes from this website I've received the warning below.
This particular time I placed a few logos on a large rectangle and soft grouped. Nothing particularly spectacular - BUT the warning now is constant. It pops up and I close, it pops up and I close. I think you get my meaning.
I've rebooted the computer, and run the program as administrator once. The problem still persists on this particular file only.

It's getting a little worrisome. The site is www.northeastspca.org. The pic of the warning is enclosed. I'm a little perplexed actually. It only happens on this particular file.