I've read a number of people complaining about ink globbing from Fisher pens, and I've never been able to replicate the issue. Weird.
I wonder if it has to do with altitude. I live at 5300 feet.
[edit - Wait... Fischer markets these things as "astronaut" space pens. And if astronauts are actually using these pens at their altitude, they'd be having to deal with ink globs the size of bowling balls. So maybe it's something else besides altitude. ]