QB Issue Resolution:

Let’s make sure your computer meets the QuickBooks app requirements for Mac before performing any troubleshooting steps. If you have met the system requirements, you can clear the cache in the QuickBooks app to refresh it.
Here’s how:
  1. Select Help.
  2. Choose Reset App Data

If the same thing happens, you can uninstall and reinstall the app on your computer. You can check out this article for the steps and details: https://quickbooks.intuit.com/community/Apps/QuickBooks-App-for-Windows-and-Mac-General-support/m-p/…

Resolution for Issue 'upgraded QB and my ios – have totally blank screen, no dashboard, no info, no login screen. Any advice?' available: Yes (Solved).
Source: Intuit Community forum.

upgraded QB and my ios – have totally blank screen, no dashboard, no info, no login screen. Any advice?: 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.

Support for Blank screen
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Error Recovery for Blank screen [Canada]
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