I've noticed a small issue with my email client for quite some time now where composing a new email will have several blank lines by default.
It's not too much of an issue to simply delete them but hey, maybe no one had pointed this out before! So I filed a bug report only to get this response... basically it's not a bug, its a feature!
Yes I would say it's most likely just a technical problem, I just found it funny they didn't come right out and say that.
My first thought was along those same lines but I do have both my personal signature and the mobile signature disabled in the settings.