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Reworked D drive and now using it. Thanks all for the help!

I asked AI about your problem 🙂 1. Toggle Hardware Acceleration (Most Common Fix) PTE relies heavily on the computer’s graphics card to encode MP4 videos. A recent graphics driver update can sometimes cause errors. [1] Have him go to the Publish menu -> HD or 4K Video. Look for the Hardware Acceleration checkbox at the bottom of the window. If it is checked, uncheck it and try publishing again (or vice versa). [1] 2. Check the Destination Folder (Permissions Issue) Sometimes Windows or macOS blocks PTE from writing a new video file to certain directories due to recent security updates. Ensure he is not trying to publish directly to an external hard drive, a USB flash drive, or a cloud-synced folder (like OneDrive, Google Drive, or Dropbox). Have him change the destination path to a simple, local folder directly on his main drive, like a folder on his desktop or local C:\ drive. 3. Scan for a "Corrupt" Asset or Missing File Because the failure happens on this exact project file across multiple versions, there is likely a single corrupt or unsupported image, audio track, or video clip embedded in the timeline. [1] Look for missing files: If a file was moved or renamed, PTE might show a "File Not Found" warning on the timeline. Isolate video clips: If he has embedded shorter .mp4 or .mov video clips inside his slideshow, one of those clips might have a codec that is choking the encoder. Have him temporarily remove any video clips from the timeline and see if the show publishes as an MP4 with just the stills. [1, 2] 4. Create a Clean Test Zip To verify if it's a system issue or a file path issue, he should use the built-in backup utility: Go to the main menu -> File -> Create Backup in Zip. Save that zip file to his desktop, unzip it into a brand new folder, and open the new .pte file from there. Try publishing from this clean, consolidated folder. [1] 5. Check for Third-Party Interference Sometimes antivirus software flags the temporary encoding processes PTE uses to build an MP4 as suspicious, blocking the file creation. He can try temporarily pausing his antivirus program for 5 minutes just to see if the video publishes successfully.

Try loading the Sample Project from HELP. Publish at the same settings - will that publish OK? If so, start looking at the content of your project. How many slides, Images, Videos etc. DG

Is drive D a Physical drive on your computer? Is it connected via USB - if yes then try disconnecting & reconnecting Does it have enough free space? Can you create an exe on the same drive? Try a different Drive & see if it will create I cannot see anything wrong with your settings. Jill

Okay, so the transitions have been added in reverse order. When you add this second transition, the first image displayed is the previous slide so the effect isn't the same as before. I've put the link in the first post; I removed the previous one since those transitions are included in this version, and I've also changed the video to show what they look like.