HI I Just upgraded to El Capitan yesterday.
I have my DVD IMAGE by TOAST in other machine and it was working with popcorn 3.04 in Yosemite.
today I tried to mount my dvd and I got a Message from popcorn , "XXXXX.toast" cannot be used because it is not a valid DVD Video image.
That´s all, I tried to uninstall Popcorn, and install it again but problem persists
I hade this option from several DVD that need to use because I changed my DVD Player to a sad disk, remote disc is too slow.
some help will be appreciated.