Mocha Pro 5.6 OFX using input alpha as Garbage Matte - not getting it?

Mocha Pro
#1

Trying to use an embedded alpha GMatte as a mask for a Laptop Screen track - I add a layer with a nominal shape and then link to the input matte.

Mocha complains about 8 bit file and then flags “can’ get matte” every time I try to track - what am I missing ?

Thx

#2

This is actually a bug we are working on, please stand by, it should be fixed in the next point release. Sorry for the inconvenience.

Cheers,
Mary