Hi there, Susan.  I can see the importance of having accurate and up-to-date data in your reports.

The issue you're experiencing with missing data in the Customers & Receivables and Sales reports in QuickBooks Mac Plus 2024 V23.1.4 R5 is likely due to a bug or data inconsistency in your company file. Let me lay out a couple of steps to resolve the issue. 

We can verify and rebuild data in your company file. This fixes errors and other issues you're experiencing in QuickBooks Desktop (QBDT). To do this, follow the steps below.

1. Go to the File menu.
2. Select Utilities.
3. Click Verify Data. Then, select OK to close all windows.

If there are still problems with your company file, you'll have to rebuild it.

Here's how:
 

1. Go to Files, then select Utilities.
2. Choose Rebuild Data, and then click OK.
3. Tap OK to make a backup to prevent data loss along the process.
4. Click OK to continue the rebuild process.

For a more detailed process, check out this article: Verify and Rebuild Data in QuickBooks Desktop for Mac 

I’m also adding this resource for your reference, where you can search for related articles whenever you have issues with QuickBooks: Help articles for QBDT Mac.

Feel free to visit us again in the Community if you have other questions about your company data. I'll be more than willing to help you achieve your goal.