In case anybody else is having similar issues: the rings holding the shock cord tie outs that came with my WBBB have been damaging the fabric of the hammock. I guess this happens when the hammock is put into the stuff sac. I have now detached the rings and exchanged the cord locs with another type of cord loc (same weight, in case that matters) that allows me to loop the shock cord around the tie out. Will see how it goes, but for the moment it looks as if it would solve the problem.