The following change from 1.25 to 1.26 breaks my reports.

I've prepared an example in htmlpublisher.zip.

1. Extract the zip file
2. Open the htmlpublisher-wrapper.html with chrome
3. You will see something like this:
4. 
5. Change in htmlpublisher-wrapper.html the line "iframe.src = encodeURIComponent(tab.getAttribute("value"));" to "
   iframe.src = tab.getAttribute("value");"
6. 
7. The page works then as expected 
8.