I'm using the latest version of Toast Titanium 14.1 (this is the update supposedly for El Capitan) and I'm running the latest version of El Capitan (10.11.3). Toast simply will not mount a disc image (Sd2f file) that the program itself created. Nor will it mount any disc image created from previous versions of Toast (and I have hundreds of them).
This is a major bug, and it is present in many previous versions of Toast. Roxio has known about it for a long time, yet they seem to lack the ability to fix it, or perhaps they don't even care to try. I know of no other software that has a selection in its own menu (Utilities > Mount Disc Image…) that simply doesn't work. This bug has been reported to them many times over the last few years, but the company can't seem to support its own product.
Does anyone know how to mount a disc image created in Toast?