Symptoms

1. You are trying to recover the backup of an MBR disk using Bootable Media
2. You have converted the disk from MBR to GPT 
3. You go to Recovery tab and choose a backup with GPT disk inside
4. You switch to 'Volumes' in 'Backup contents' and choose all the volumes
5. Trying to choose a target disk for the recovery is not possible:

Cause

Issue in the product.

This issue will be resolved in one of the upcoming updates.

Workaround

To resolve the issue, restore on Disk Level by choosing the entire disk for recovery (not volumes).