typreview_error retrieving viewport DIB

[super gnu]

the ty-preview was working fine when i first installed the tyflow update.. however now  (i have changed nothing in my setup, software or hardware wise) it fails with the error message listed in the thread title. 

ive tried with two different max scenes. 

i thought it might be due to having two copies of max open, but  it does the same with 1 open.