Finally!!! Did the obvious and it worked.... I removed v 2.0.0 and then did a fresh install of v 2.1.2. Downloaded from the WSJT Home Page and installed flawlessly. Using Pi4B and Buster.
WSJT-X is being CAT controlled by Hamlib; RX is SDRPlay RSP2Pro and GQRX.
Tnx to all for the encouragement and ideas.
73 de Bob