QB Issue Resolution:

I would rebuild this data file. File menu > Utilities.

You also can try simply to Re-sort the list: View menu.

Resolution for Issue 'How do I create a new job (that I can use on invoices)?' available: Yes (Solved).
Source: Intuit Community forum.

How do I create a new job (that I can use on invoices)?: 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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