Thanks for that link!
I haven't had any come through my carpeting, but, one day while digging under the dash, I decided to take apart an electrical connector, and found it covered in a sticky goo. It had the consistency of thick honey, and was close to yellow..
Thinking about it the only reason it looks dark in my car is cos its settled on black plastic...
Heat is the common factor as is location ie glue "melting" and dropping to lowest level.
I feel slightly better now!
The car is going to be checked over next week...