QB Issue Resolution:

For case isolation, let’s replicate this issue to a sample file. Log off to the actual file and open up a sample file. Go to Customer Center and click on Create Invoices.

Resolution for Issue 'QB Pro 2012 everything works except click on Create Invoice and it just spins and doesn’t open. The last update says nothing updated' available: Yes (Solved).
Source: Intuit Community forum.

QB Pro 2012 everything works except click on Create Invoice and it just spins and doesn’t open. The last update says nothing updated: 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 Invoice
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Error Recovery for Invoice [Canada]
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Additional Support Options: