I’m using 4.03. I know there are some issues with elements that were related to Poser and I think this is one of them. It didn’t install in the usual hair directory, but one in the runtime folder. I can’t make heads or tails out of how things are filed in this program.
There are four kinds of hair. Three are Poser compatible and therefore install under runtime: Prop hair, the oldest, installs in Runtime/libraries/Props, .PP2 extension. Character type hair splits into .CR2 extension, installs in runtime/libraries/characters and .HR2 extension which installs in runtime/libraries/hair, .HR2 and .CR2 are pretty much the same thing but for the file type. And the newest is Gen 5 hair for Genesis, which installs in (your content folder )/hair and is Studio only. It all makes sense if you understand which file types originated in Poser and which in Studio. (And none of them actually need to be in the folders they install into by default, I drag all my poser hair into the runtime/libraries/hair folder to keep it all in one place).
There are also two types of dynamic hair, Poser and Studio, but they are rare as hens teeth.
Getting back to your problem, there are two generations of Cuffed Tail. Cuffed Tail was for Gen 3, Cuffed Tail 2 was for Gen 4. Which are you using? Both work fine, and poser format stuff works fine with Genesis in general, but it’s possible you hit on something that’s a problem - is the problem repeatable and what does your log file say?