Bug in macOS 26 Tahoe makes DaisyDisk “forget” granted sandbox access (App Store version only)
If you are using the App Store version of DaisyDisk and recently updated to macOS 26 Tahoe, some of you may have noticed that every time you launch DaisyDisk, it asks you to “Unlock” the startup disk, while normally, such “Unlock” command is done only once, and then DaisyDisk remembers the granted access to the disk on the next launch.
Turns out, this issue is caused by a bug in macOS Tahoe itself. The issue (r. 157722315) was confirmed by Apple and expected to be fixed in future minor updates of the operating system. So far it hasn’t been fixed in macOS 26.0.1, but if you are reading this later, try to update your system to the newest version.
Alternatively, you can switch to the more powerful stand-alone version of DaisyDisk, free of charge, using this link.
P.S. Sandbox access, granted by the “Unlock” command, is unrelated to the so called “full disk access”, which is a different, independent plane of macOS security.