Let's make sure that you're able to delete and save a credit card for your customers, 

zoesheetmetal.

We can perform some steps to fix this issue. There are times that the browser is full of frequently accessed page resources that cause some unusual responses. To isolate this, try logging into your QuickBooks Online (QBO) account using a private browser (incognito). Here's how:

• Press Ctrl + Shift + N (Google Chrome).
• Ctrl + Shift + P (Firefox).
• Control + Option + P (Safari).
  
  

Once signed in, go back to the Customer's profile and try deleting and saving the credit card. If it works, return to your default browser and perform a clear cache. Every so often the cache becomes overwhelmed with older data which can potentially cause viewing and performance issues. Clearing it will refresh the system, and you'll be able to work with a clean slate. However, if the issue persists, try using other supported browsers. 

Please know that I'm only a few clicks away if you have any other issues or concerns about customer credit cards. I'm always here to help. Enjoy the rest of the day!