Thanks for getting involved with this thread, Krista42. I appreciate your detailed information.

Since you're encountering the same issue on your Enter Bills screen, and you're being asked to assign a class to expense lines when you've already done so, I'd initially recommend confirming your product is up-to-date with its latest release.

If the problem continues while you're on your product's latest release, you can use the Verify Data utility. It identifies known issues within company files and informs users if their Rebuild Data tool needs to be utilized afterwards.

Here's how it's used:

1. Click Window, then Close All.
2. In your top menu bar, go to File.
3. Choose Utilities.
4. Select Verify Data.

In the event its results show a "Your data has lost integrity," message, this indicates there's damage in your file. You can use the Rebuild Data utility to fix it. For specific errors, there may already be a resource for them on our support site.

If it displays a "QuickBooks detected no problems with your data," notification, or you've searched our help articles and didn't find any existing resources about the specific error it displayed, you can move on to troubleshooting with our QuickBooks Tool Hub.

Here's how:

1. Close QuickBooks and download a copy of the utility's most recent version, then run it.
2. Follow along with your on-screen steps to complete installation and agree with our terms and conditions.
3. Once it's installed, double-click its icon to open the tool hub. If you can't find your app, perform a search in Windows for "QuickBooks Tool Hub" and select the program.
4. Access your Company File Issues tab and use the Quick Fix my file and QuickBooks File Doctor tools to troubleshoot your company file. In the event you need additional assistance, choose File Dr Help.

If none of our recommended troubleshooting solved the issues you're encountering, you'll want to get in touch with our Customer Care team and reference our ongoing investigation (INV-93725) into the Write checks screen not functioning properly. They'll be able to conduct further research with you and either add you as an affected user to the existing investigation, or create a new one if necessary. In the event your account is added to an investigation, you'll be notified about any updates relating to it through email.

I'll be here to help if there's any additional questions. Have an awesome day!