Never had a poly problem (I hate tying the knots, though). The weirdest string problem I had was when I wanted to revisit the past and use some Blue Star.
Essentially Blue Star is wadded up Saran Wrap. If you remember, the big selling point to Blue Star was that it would "shred" during play, causing a gut-like texture of sorts. The Kmate jaws didn't do well with this stuff! Just nothing to hold on to. I scrapped the mission.
To Praise, To Bless, To Preach--the Dominican Order