Toast won't compare/open files in Time Machine under Mojave

[Darren Duncan]

I have used Toast for a long time, including versions 4, 5, 6, 8, 11, and now 17.  One of its most useful features for me, that I use frequently, is Utilities->Compare, to verify that various backup copies or moves of folders are in fact duplicates and not corrupted or missing files.

Every version of Toast, or at least the Intel-native versions 8, 11, and the newest 17, have an incompatibility with MacOS 10.14 Mojave.

Under MacOS 10.14 Mojave, Toast shows the red Forbidden icon when trying to navigate into a Time Machine backup folder, whether using the standard "open" dialog box or dragging folders to the Compare window, so files there can't be read or compared.

This problem didn't happen under previous MacOS versions, and other applications such as Finder and BBEdit under Mojave can read files in the Time Machine backup folder just fine, and without needing to ask for permissions.

Mojave clearly does something subtly different with Time Machine file permissions, either intentionally or as a bug, and Toast needs an update to accommodate it.  I upgraded to Toast 17 today partly thinking that it may fix the issue that version 11 had, but it didn't.

Do you know what's going on here?

Thank you in advance for a quick fix, or documented workaround.