Exactly...
It is just solidified...
You can put the bottle in a pan with half an inch of water and heat on low until it is thinned out, if just placing it in hot water does not completely thin it out...Many times, when you take away the heat, it re-solidifies and you need to do this everytime you intend to use the product.
Some people believe that "heat" degrades or ruins the product...I can't tell you for sure, but I have seen this happen with people who create their own products or companies who aren't up to speed with what they are doing.