We are actively investigating a recent issue affecting some MediaSeal users on Apple silicon M4 and M5 devices.  We have found that the changes, introduced by Apple in their latest macOS Tahoe 26.4.1 (released 9th April 2026), can potentially affect how MediaSeal interacts with the operating system, resulting in system instability.  We are working to address this instability and will share further updates as soon as they are available.

Currently, our recommendations are as follows:

• We strongly advise that users do not upgrade to macOS Tahoe 26.4.1 on systems running MediaSeal at this time.  To help ensure continued stability, and avoid potential instabilities, please remain on your current supported macOS version until a new MediaSeal version is released that restores compatibility.
• For users who have already upgraded to macOS Tahoe 26.4.1, we recommend that you refrain from installing MediaSeal on these systems until an updated version is available.
• If MediaSeal is already installed on a device running macOS Tahoe 26.4.1 and you are experiencing instabilities, we advise temporarily uninstalling MediaSeal as a precautionary measure while we work on the new release.  For step‑by‑step instructions on how to do this, please follow our guide: How do I uninstall MediaSeal Decryptor?

We really appreciate your patience and cooperation as we work to address this compatibility issue.  Ensuring a stable and reliable experience for all clients remains our top priority, and we will share further updates as soon as they are available.