Hi all! In case my experience could help anyone:
I also got this "white square" with "spinning circle" which made Adobe Acrobat Reader DC hang/freeze. But, here we are talking about the application beeing published in an on-prem Citrix site, as a "seamless application", and also using the 32-bit Norwegian version, running on Windows Server 2019. In addition, it's packaged as an AppV-application, not locally installed. Nevertheless we have been running this setup for quite some time, and only this last week (from after April 1st) the issue has occured.
What seems to fix it in our case is adding the following registry setting via GP Preferences:
Key: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Adobe\Acrobat Reader\DC\FeatureLockdown
Value: bWhatsNewExp
Data: 0x1 (DWORD)
From Adobe:
This feature was phased in incrementally over 2022. When enabled, the default user on first launch will see a What's New screen as well as a See new features notication. These UI items appear once. Possible values include:- 0: Enable the What's New experience.
- 1: Disable.
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So, after disabling it (= setting the value to 1) the problem disappeared!