Inventory: Have to look into that, possible that the Wastelanders update broke some HUD/menu shader definitions. For the time being you can simply switch to EdgePeek mode. I’d recommend that for using menus/inventory screens anyway as it is more comfortable.
Workbenches: Probably related to Direct VR positional tracking, something similar can happen when you sit down on a chair for example. You can either disable the positional part of DirectVR on the DirectVR page of the vorpX menu or temporarily disabale DirectVR entirely with ALT-K before using a workbench. The shortcut can be changed in the config app.