White window flashes when inserting citation
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HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Zotero\Zotero
On laptop where Zotero is working, it says where current version is 5.0.77
On laptop where clicking Add/Edit Citation in the Zotero plugin gives the white flash and no red text entry bar, the version is 5.0.76
This is despite the fact that the version listed when you go to Help About on both computers is 5.0.82.
Should I try uninstalling and reinstalling Zotero on the laptop where it is not working?
Since this is certainly caused by some interaction between your security software (and possibly group permissions) on the computer and isn't a Zotero bug as such and cannot be debugged with any standard procedures, I think we can provide limited troubleshooting ideas. You could try using the Word plugin on the computer with a different user account to see whether account specific configuration may play a role.
Reinstalling Zotero generally does not help with Zotero issues but in this weird case perhaps could not hurt, even if the differing registry key is very unlikely to be the culprit.