I am trying to balance my credit cards and the entries are not posting to the reconciliation file...it used to work and it only happens on some of the credit card files

What exactly is happening and are there any error messages?  And which version of QBDT?

Is there any pending in the Bank Feed or has everything been matched?

Hello, Janet. 

I'd like to add something to the mix aside form Pete_Mc's question. I'll lay down a bunch of solutions to help you balance your credit card accounts. 

To start off, you'll want to ensure that the Statement Date on the Begin Reconciliation screen is correct. An incorrect might've caused those entries to not appear on your reconciliation file. 

On the Reconciliation screen, click the Modify button then change the Statement Date. 

Aside from the Statement Date, you'll also want to ensure that those entries are not reconciled yet.

Check your credit card account's register and make sure those entries do not have a check mark on them. Here's how to review your register: 

1. Go to Lists, then select Chart of Accounts. 
2. Find your credit card account and open the register.
3. Review the credit card entries and ensure they don't have any check marks on them (Check mark column). 
4. If they have any check marks, click the mark to remove it. 

Be careful when doing this since it affects the reconciled balance in the account. Check with an accountant before doing this. 

Just like what Pete_Mc asked, you'll also want to ensure that those entries have been categorized, matched or added to your books. 

After resolving the issue, do you need help checking your financial data? You can run reports to help you get the report you need. This article will help you familiarize the preset reports available in QuickBooks: Understand reports.

You're still welcome to post your reply here if you have other questions regarding the reconciliation process. Got any other concerns regarding QuickBooks Desktop? Add them to your reply and I'll see what I can do.