All you can do is test all versions of DDM 2.0 and DDM 2.1 found in the FAQ DDM (Dell Display Manager). If all have the same issue, then go back to DDM 1.0. Then periodically check the S3422DWG drivers page for a newer version to test.
After version 2.x there's has a problem. The DDM application has a problem because it produces the left side of the screen to not work. I had to uninstall it and look for an older version. This was a second change I gave to the application. Best regards,Michael F
S3422DWG, DDM 2.x, left side of screen won't work