After a number of years using PW, I have now downloaded TW trial version. I struggled for some time to post a tour, but I am almost there. I have uploaded a tour(which works fine on the pc) but only seems to load to about 90% on my site.
I had (what I think is) the same problem based on your description. If I were to play a hunch, you probably checked the "encrypt images" box just before uploading your tour. Try uploading again with this unchecked. It has something to do with some serveres not recognizing jpeg1 files. What does that mean? I don't know. But it worked for me.