Almond Bark Got Hard
My almond bark got hard while melting.
I am using a double boiler to melt the almond bark and as soon as we started to dip, it turned hard.
Sounds like you either overheated the chocolate, or you may have gotten a little moisture (water or steam) in the chocolate almond bark which has caused it to seize. Even the tiniest amount will have that affect.
What were you dipping in it? If it was something like fresh strawberries that had just been washed, that could have been the culprit (a stray drop of water).
Depending on why your almond bark got hard, there's something you can try to salvage it. Add 1 tablespoon of shortening for every 6 ounces of chocolate and stir it through while warming the chocolate.
If that doesn't do the job, you'll have to use the almond bark for other recipes (instead of dipping) and start all over again with a fresh batch.
Let us know if you are able to salvage your almond bark and make your treats. If you do, give details of what you did as this question gets asked over and over again.