Definitely a PC software issue.
Tried Training Peak Virtual on PC and it works fine with ERG mode.
Nothing to do until bug fix update.
Some additional info (just in case someone at Zwift is actually reading this). Attempted a group workout today. No ERG as with solo workout. Behavior was a bit different..I think it was the banding functionality trying ot keep me up with the pack, and so “accidently” helping me keep a power target. But still pretty tough to keep a number steady.
Also tried a free ride on Hilly Route just to see if the game would give me any resistance. Answer: None, nothing anywhere regardless of indicated gradient. Felt like a totally flat ride even up the 6-7% at the beginning of Hilly Route.
Def Broke.
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Thank you for the update, I’m awaiting the push with baited breath…
(“…restistance is futile issue”….cute. 
lol..)
Dennis
D