I was trying the Slide style, 6- sided cube in Version 9. Having fun, and soon found several questions that were pre-empted when I could not save the .pte project file. If I remove the style slide from the slide list, the project will save normally. The attached image shows the error message that occurs no matter the variables I've tried. I was able to Publish an .exe file which runs fine. The .exe is 528 mb for the 1-minute 20-second sequence. The sequence that won't save is one video and utilizes the animation window for the cube work. If it would be helpful, I could upload the 528mb file so it could be downloaded. Perhaps this is something someone else has encountered? I don't like to report a "bug" unless the evidence supports the thought.