Multiple citations on MacOS v5.0.60--> Blank

Hello: Zotero was working great for the last 4-5 months, v 5.0.60 on a MacOS laptop. Last week, I noticed that when I tried to add another text to an existing citation with multiple references, pressing the rightward pointing arrow made the citations in the text box on the right disappear, and the OK button grays out. I can press the cancel button at that point.

I can still add single citations just fine in the document I'm working on. I can open a new Word document and add a new citation with multiple references, but not in the main document I'm working on. The only thing that's changed is that I'm getting close to my storage quota-- would that result in these symptoms? Thanks!
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