Brand new owner, got all my devices migrated from Vera except this one which is giving me fits. I'm able to exclude/Include it but it just adds it as a "Device" with no on/off/dim commands, just configure. This is a plug in dimmer module.
Set the driver to generic zwave dimmer. Click configure after you change the driver. Or better yet, replace it with a zwave plus module. Those modules are a pain in the butt.
Does your module have a switch on the back next to the prongs to change it from dimmer to switch mode? Mine got bumped in between the two and gave me a hard time before I noticed the little switch back there. That might have been a different one now that I think about it.
I'd take a look at your device page and see if there are any devices showing up in there besides 0x01 (001) which is the hub that are blank for clusters and devices. Those would be failed pairs. They can cause the hub to stop responding. Also check your zwave log under zwave details and the live log/past log for errors. The earlier you track down the issue the more options you have to deal with them.