Could you please send me a LR Desktop diagnostig log - best as a private message with a downloadable dropbox link.
You can trigger the log via LR Desktop prefereneces -> Lightroom Mobile and when you hold down the alt key you will notice a generate diagnostic log button.
I seem to have solved my issue, but I am not sure exactly how. I did remove all synced collections and deleted / reset data from all devices and the web site, changed my password. I then started over in Lightroom building a few collections. At this point images are syncing with the website and with my iPad.
PROBLEM STILL EXISTS...
I spoke to soon! I tried adding a couple of more collections to sync. Lightroom shows "Syncing 814" photos on upper left, but never apparently syncs any. If I exit Lightroom it notifies me there are 814 images to sync. When I reopen it seems to pick up and stall where it left off. These new collections are not posting - this is the same problem as before.
I am pretty sure there is a serious bug in Lightroom here. I encourage support to contact me.
I have concluded that at this point, Adobe Lightroom Mobile sync simply does not yet work.
Just send you a priate message. -Guido