I'll contact customer support. (I'm using SnagIt 13.0.3v)
... please make sure that Snagit is being closed completely (and correctly) rather than being force closed? So, please give this a try.....
-Open the Editor and create your Border Quick Effect
-Close the Editor by going to File > Exit
-Now check your system tray (down by the clock on your machine), and make sure there are no Snagit icons there. If you see the red Snagit icon there, right click on it and choose Exit
-Now reopen Snagit, and check to see if the QuickEffect is still there
When I add a Quick Style, I like for it to be presented at the top of the little Quick Styles area so it's easy to find. But sometimes that area inexplicably rearranges the styles and places my own added Quick Styles at the bottom and it appears they have been removed. But all I have to do is scroll them into view.
Cheers... Rick :)