Some libraries and their dependencies need to be unblocked in "File Properties" dialog to make effect. It can be annoying when there are a lot of files, or some plugin doesn't show up when you forget to do that. File block monitor will pop up when libraries are blocked.
Navigate to "Pancake" menu, check/uncheck "Enable File Block Monitor".
This feature is disabled by default.
Safe mode will suppress this feature temporarily.
It is all about security. The default behavior of Pancake should not enlarge attack surface of Rhinoceros and Grasshopper.
You can override the security measure by clicking "Always unblock" in the pop-up window.
You will receive notification again if you turn off and on File Block Monitor.
You will always see a report window of what are unblocked afterwards, even if you turn on Automatic Unblock.
The current loading mechanism of Grasshopper ignores the block on this library. It is recommended to unblock the file, in case that the library is referenced by others.
The file is not loaded due to the block. The file is usually a related assembly. You need to unblock it to make some libraries work.
Rare. The file might be a dependency of another library. You need to unblock it to make some libraries work. It is also possible that the plugin is encrypted and Pancake cannot determine what it should be.
Pancake will try to load the unblocked libraries but cannot guarantee success. It is recommended to restart Grasshopper / Rhinoceros if you unblocked something.
If enabled, the monitor will notify you everytime new plugins are installed.