Cura 4.x causes underextrusion on my Ultimaker 2+

[Phalconheart 2]

Is anyone else having this issue? I'm trying to slice a model in Cura 4.3 (even went back to try on 4.0) and I can't seem to get a proper first layer. It's way under extruded. I thought maybe it was an error on my part like the bed needing leveling or bad filament or something. But when I try to run any GCode that was generated before the upgrade, it prints flawlessly. So my printer and filaments are fine. No under-extrusion issues at all!?? I've tried slicing with different layer height settings and get the same results.

Any suggestions?

thanks,

Pat