After the automatic DBR finishes, while still at the Launcher, run an EDBR. To run this, press the CTRL-key at the same time while clicking on Rebuild Database.
Rebuild Database is found under the Developer menu at the top of the Launcher and also on Content Manager.
When the EDBR has finished, go into Content Manager.
Click on where it says Installed and change that to Faulty.
This may take a bit of time to search the content.
There will be faulty assets shown. Don't panic!
Select them all by clicking on one and then pressing CTRL+A at the same time on your keyboard.
With all the assets still selected, right-click and choose View Errors and Warnings.
Doing this should clear most of them up. To find out, exit the screen and repeat the faulty assets view again.
If there are any faulty assets left, these are the ones you need to address.