There are three things on PPRuNe that have only one "s":
Jeppesen
Asymmetric
and of course...
Spelling nazi.
Leaving now, before I get
sin binned. Oh look, that only has one "s" too!
And yes, I dislike Jeppesen too. Disliked it in GA - complicated on PC & expensive - and dislike it in RPT. I haven't the luxury of a choice however.