I'm attempting to use the "Publish Online" feature, but have only run into errors thus far. The progress bar moves along, and things seem to be almost finished, but then POOF! The first time I got an "Error 17" message, the second time I got "An error occurred" without further details, and the third time I got "A serious error" followed by a shut-down of InDesign.
I've read some of the other discussions, and it appears to happen to documents with large videos in them, which this does not. It does have a lot of pictures, though. When exporting as a PDF for the printshop it sized out at 550ish mb.