No longer able to save transactions

Try opening your QBO account on any private/incognito browser.

Hi placeholder2021, 

Thanks for connecting with us here.   Welcome!  Your time is valuable and It's essential that you're able to save your work in QuickBooks Online.  I'll be happy to provide more information so you can get back to business as soon as possible!

In this type of situation, we recommend clearing cache on your preferred browser and then log into your account with a private or incognito browser, to see if you get the same result.  This type of unexpected behavior can also be associated with user permissions for which it's best to reach out to your Administrator.  In addition, it can also be caused when an account falls inactive. Please check the account status by going to > Settings ⚙ > Account and settings > Billing and subscription. 

If you continue to encounter this unexpected behavior, please contact us so we can look further into this from our end and ensure you're able to successfully complete your QuickBooks goals!

Schedule a Callback or start a Chat: click (?) Help in the upper right in QuickBooks Online > enter "Contact support" > hit Contact Us > provide a brief summary of your situation > hit Let's Talk > choose Get a callback or Start a Chat.
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Let us know if you have other questions.  We're here for you!