If you're running Windows, there is a 3D_Bridge_User_Guide.pdf that is installed in C:Program FilesDAZ 3DDAZStudio4docsPluginsPluginNotes if you're running the 64 bit version of DS4 or C:Program Files (x86)DAZ 3DDAZStudio4docsPluginsPluginNotes if you're running the 32 bit version of DS4.

There is no mention of Photoshop Elements support in the DS4 version of the bridge guide.  On page 1 is states:

Photoshop Versions Supported

Macintosh

• Photoshop CS2 (v9.02) or higher

PC

• Photoshop 7 or higher

Installation - Macintosh & Windows

Versions of Photoshop the 3D Bridge works with:

1. Macintosh - Photoshop CS3 or CS3X and OSX for Intel
2. Windows - Photoshop 5 through CS3 or CS3X

The two statements don't agree, so I'm not sure which one is accurate.. LOL

In order to get the 3D bridge working with DS3A again, you probably need to uninstall the DS4 bridge and re-install the DS3A bridge that was working with your PSE7 install.