When pressing (Cmd Z) Undo, the shortcuts for Eye Dropper (Cmd) and Pan (Space) become inoperable. (Other keys could potentially be effected as well) To "fix" this, clicking on the internal window of the file restores functionality. If "multiple document mode" is set to Windowed, this bug appears more often. In Tabbed mode, it is less consistently reproducible. Behavior was also observed in version 3.1.4 2011 MacBook Air MacOS 10.12.6 Intel HD Graphics 3000 1.7 GHz Intel Core i5
*** Bug 385491 has been marked as a duplicate of this bug. ***
*** Bug 379576 has been marked as a duplicate of this bug. ***
*** Bug 381067 has been marked as a duplicate of this bug. ***
I'm sorry, but I just cannot reproduce the issue, nor can the other macOS developer here at the sprint.