Sometimes when I try to hatch and box eggs at the same time, this is what happens after I select and confirm from the dropdown menu (as in, choosing a box for all eggs at once).
My two cents: I've been having this problem too, and it only started cropping up very recently (I haven't kept track precisely, but I guess somewhere between two weeks and a month?). I'm running the latest version of Chrome. I'm not sure if this has anything to do with the problem, but anecdotally I feel like I encounter it more often when I come back to my GPX+ tab after not using it for awhile. If I refresh once or twice, it pretty reliably goes back to working normally.
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