In certain circumstances it's possible for Morph transitions to be broken as a result of compression. This occurs when the two images used in the Morph have been altered in some way to make PowerPoint think they are different images.
You can check this easily using Slidewise to see if there are two separate images, or two instances of the same image:
This problem occurs with NXPowerLite and also PowerPoint's built-in compress pictures feature - both break the Morph animation in these circumstances with default settings.
To fix the issue we suggest deleting the 'target' image, copying the 'source' image and pasting it into the target slide and reinstating the Morph. This will return you to having a single image with two instances, rather than two separate images. Compression will work fine after this.
Alternatively, the issue is triggered by the setting to delete cropped areas of pictures, so an alternative approach in NXPowerLite is to create a custom profile that has this feature unchecked and use this to compress your file. It will result in less compression but it will not break the Morph animation.
For the Compress Pictures feature in PowerPoint, uncheck the highlighted box when compressing.