Some of my customer details appear to have vanished.

Hi chris-epc4energy, thanks for joining the Community

Please confirm which platform you're using to access QuickBooks (app or website) and provide an example of the details that are missing so that we can help further.

QuickBooks Online uses browser cache and cookies to run faster, but sometimes these can also block web pages from loading. To check for any browser issue that may be causing this, please consider clearing the cache and Intuit-specific cookies from your browser - here's how.