I cannot seem to make the FlyCuts work!
To control how patient FlyMSG is while you type a completed FlyCut. If sometimes, your FlyCuts do not complete for you (meaning actually expand once you type out the shortcut), you type slower or you're using a long FlyCut; try increasing the Timeout value. The default is 5000 ms.
You can do this by simply clicking on the extension icon, you will see a slidable bar at the bottom of the app, here you can increase or decrease the default timevalue for slower or faster writting.