“I was afraid I’d have a messed up back up file if I backed up with the problem going on.”

This most likely is a Video Display Program issue, not a data file issue.

“but the display problem remains – with that one register only. I’ve been able to complete all my […]

Resolution for 'black backgrounds issue: 'my screen went funny with black backgrounds and layout inconsistencies?' available: Yes.

The black backgrounds issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the black backgrounds issue yourself by looking for a resolution described in the article. If it is a complex black backgrounds issue or you are unable to solve the issue, you may contact us by clicking here or by using other black backgrounds support options.

For more information about resolving issues related to black backgrounds in Quickbooks/QBO or to get support for the issue 'my screen went funny with black backgrounds and layout inconsistencies?', click the link below: