Hi Inbi
I believe I may have encountered a similar problem when updating to Woocommerce 2.0.20.
What happened: While updating woocommerce I received a message saying that the update had failed to install. When I went to view the public side of the site I had a white screen with warnings about php errors in black.
How I resolved it: Looking at the error messages and the files on our server there seemed to be a number of php files missing. I have replaced all of the woocommerce files from a backup taken prior to the update. Perhaps this would work for your site?
Regards
Ian
