unable to read (backup or MKV) DVD disks

[Smiske]

I'm using MakeMKV (for Mac) v1.9.2 with licence and this works great for Blu ray. However, I would like to backup a DVD disk and all buttons (backup and save titles) remain grayed out.

I thought it was possible to use MakeMKV for both Blu ray as DVD?

[Woodstock]

"Backup" option only works on Bluray. On DVD, you should be able to "open" it with the large button, unless there was an issue with loading the disk's directory.

If that's the case, we would need to see debugging logs for when you were loading the particular disk. The FAQ link in my signature explains how to turn that on.

And you should consider updating to 1.9.4, if you are working with newer BDs, as some of the newer disks will make your BD drive incapable of decoding BDs. Even 1.9.4 can be affected by the newest disks... Mike is working on that.