Hi, @pjvet.

I value your feedback about this issue and I'm here to take care of your concerns today.

If a user clicks on the Accept as Solution tab, a reply will be marked as solved. Meaning, it resolves that user's concern, but it doesn't mean that the thread is already closed. Any other users can still post and ask follow-up questions from there.

On the other hand, the investigation about Could not save the information and Unable to Save To Do from the Customer/Vendor Center is still open and in progress. Our engineers are constantly working to resolve the issues as soon as possible. It's our priority to give you the best possible experience while working with QuickBooks. Thus, I recommend giving a quick call to our QuickBooks Desktop Support. A live representative can check your account securely and add your name to the list of affected users in this investigation (INV-46267). 

For now, please make sure to update your QuickBooks Desktop to the latest release to get the latest fixes and security updates.

Please let me know how else I can help you with QuickBooks. I've got your back, and I'm always here to help. Have a good one!