Your file opens in Photo Mechanic and Photoshop on my computer. It also opens in several web browsers, and the default "Photos" app on Windows. It seems that only Preview has a problem with this file. I am unclear on where Photo Mechanic is causing the issue here. If I do a "Save as" operation on this file using Photo Mechanic, it creates a new JPEG that Preview has no problem reading. If you have a known good file and provide us with steps of how to make the problem happen on that file using Photo Mechanic, we'd be happy to look into it.