STEPS TO REPRODUCE
- Create a page from Office
- Select a .ppt Office Presentation file (or the one attached here)
- Click 'Import'
- Click on 'Result' link
The page is created and the slides from the presentation files are displayed properly.
The page is created, but the slides are not displayed on the Gallery macro (instead is displayed an endless spinning wheel).
In console, every time the navigation arrow from the macro is clicked, the following stacktrace is displayed:
I've tested also by importing an .odp file and slides were displaying properly.
The issue could not be reproduced on XWiki 10.11.1.