QB Issue Resolution:

That does sound unusual for sure.

Disappearing fields and the inability to edit can sometimes be due to past data saved in the browser. I would recommend clearing the browser cache (be sure to close the browser after clearing for the changes to take effect) or trying a different browser. If you need information for clearing the cache you can find it here: http://support.qbo.intuit.com/support/answers.cfm?faq_id=1038

Resolution for Issue 'Hello- QB is not letting me customize my invoice and the footer of my invoices keep disappearing.' available: Yes (Solved).
Source: Intuit Community forum.

Hello- QB is not letting me customize my invoice and the footer of my invoices keep disappearing.: this 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 issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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