CANT SET UP VISEMES FRAME AFTER UPDATE TO VERSION 20.5

I have the same problem after updating to version 20.5.
I click the visemes frame AND NOTHING HAPPEN ! I double click it nothing happen!

Refering to the image below, when I click the "Ah" frame, nothing happen and I CAN'T SET UP VISEMES!
Previous version of adobe is ok.. i can set the visemes normally..

Is there any problem for version 20.5?
HELP ME!!!!!