Using Adobe Acrobat Reader DC version 2021.007.20099 64bit. Basic functions that result in a dialog box appear blank. For example, trying to rotate a document, a blank dialog box appears. If I attempt to sign a document, click add signature, the entire application fades to black and requires a force close. I've tried uninstalling/reinstalling and this has not helped.
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I faced similar problem as well which was reported today and I have tried troubleshoot it with methods suggested from this forum. Unfortunately none of it work and highly suspect a bug might triggered this issue. Hopefully someone from Adobe will look into it.