Hi Sentient,
Sorry for the troubles. There have been many unexpected changes in DNN 5.6 that impacted our modules and this may be one of those. Dynamic Registration 4.1 and Dynamic Forms 3.4.40 and .41 are the only ones that support DNN 5.6.x (I believe there was a critical upgrade to DNN 5.6.1 to fix issues also).
If you have the Collection 4.0, you should find these in your Snowcovered account within MyDownloads. Otherwise, please make your necessary upgrades from here:
http://www.datasprings.com/products/dnn-modules Thanks!
Candace