I still have this problem and it's August 2020. I can create a new Project but can't select that new Project if trying to enter an Estimate/Invoice for that Project (or try to assign that Project to Bills). I have to EXIT QBO and re-enter. After that I can select the Project. It's like QBO doesn't recognize a new Project is created until the next time you sign in. It's been like this since I started using QBO last July. Are your newly added Projects selectable after signing out and back in? Or can you literally never select the Project no matter how long ago it was created?