I found 7.1.3 adds some chopped pixels to right edge for images in portrait (vertical) mode when long edge is specified to a number larger than 950 px. Oddly, if the image is rotated to landscape (horizontal), it doesn't mess up the output. I have tried to complete uninstall, reboot, and reinstall, also created fresh output receipts. But, the issue is there. I'll appreciate if you can suggest some ideas.
I have also, since upgrading to V7.1.3 64-bit version on Windows 7, seen a 2 pixel wide vertical right edge column of garbage pixels on (a crop of) a portrait oriented image file. Raising a support case seems the wise thing to do.