Hi Vlad,
Could you try opening the Dev Tools console, and check if you see a
JavaScript error there when that happens? Also, before that happens, are you
seeing any error on the server in the `orbeon.log`?
I don't know what the problem is, so I wouldn't be able to say if it is
fixed in 2020.1. But if upgrading is an option for you, I'd definitely
recommend you do so as lots of fixes (in addition to new features and other
improvements) went into that release.
-Alex
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