Blur suddenly stopped working

Blurr worked when I first tried Zoom last night.  The virtual backgrounds don't work and give an error message that just says “an error occurred” (this is very bad programming to have such  useless error messages)

The blur did work.  Now today the blur option has been moved to a different place and it too gives the useless error message “an error occurred”  (AGAIN VERY BAD AND SLOPPY PROGRAMMING)

How can I get blur to work again?