When Lightroom performs image adjustments, the proprietary adjustment settings are saved in the file's XMP metadata section. Other applications will not be able to apply these adjustment settings to the image, making the file looks the same as it did before Lightroom make the updates. In order for Photo Mechanic to show the image updates, you must Export out a new file from Lightroom. The newly exported file will show the image adjustments made in LR. The Export option will be in LR's File menu.
The Export utility will not let you replace the original file with the newly updated file so use the option for a unique filename in the following dialog.
Now you can see the before an after images in Photo Mechanic.
W1018038TestDelMe11244W10 Screen ShotPhoto Mechanic 5See LR updates in PMExport jpeg from LR to see adjustments in PM