Crop tool only selects 1px by 1px

Is something not working like it should? Let us know.
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2018-01-01 00:02:42

iMac27 5k 2017 running latest OS + Pixelmator, since last update, trying to crop, if I click the mouse, it select the entire area, and I can't use the handles at all to change the size of the crop. If I try to select an area, it selects a 1px x 1px area, and nothing further can be done.

Tried to uninstall / reinstall... delete the .pref file, nothing works, very frustrating!

Meanwhile, my MBP 2013 (lastest OS) does that operation fine.

Is this a software bug or a misconfiguration of MacOS, or ... ?