This is a memory related bug that causes a pop-up dialog/window to appear, after which time any and all Edit features become debilitated, including from the main menu, the layer contextual menu, and selected features contextual menu. This bug will persist even after closing and re-opening OpenJump, and the only way to correct the problem is to copy something new within OpenJump in order to clear what was previously copied when the error occurred, however, because the Edit features become debilitated, one cannot copy data using any of the Edit menus, thusly one must instead use the File > Copy to Clipboard operation which will then supersede the (corrupted?) previous data that OpenJump copied to the clipboard, which seems to be part of the problem.
The following video shows the error after it has occurred. If needed, I will put together a video showing how to create the error, but only if someone here really needs it, so let me know if you do.
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