Hello, Ken. I advise you to update to the latest 11456 build. In order to do that, please quit StarWind Management Console, download the latest stable release build from this link:
https://www.starwindsoftware.com/tmplin ... ind-v8.exe and launch the installation file. No need to register it again, as you will update within StarWind version 8. Check this step-by-step guide:
1. Check that all StarWind devices have status “Synchronized” on both nodes;
2. Move all Cluster resources from the node where StarWind will be updated;
3. Install the latest StarWind version;
4. Wait until StarWind service starts and the synchronization process begins;
5. Wait until the synchronization process is over;
6. Check that all StarWind devices have status “Synchronized” on both nodes;
7. Move all Cluster resources from the node where StarWind has been updated to another one;
8. Repeat steps 3, 4, 5 and 6 for another node.
After that please try to extend device again.