Toes go numb while on Eliptical?

Hi ladies and gents out there, so just a curious fitness equipment question here.

I usually run on the treadmill but then one day I started on the eliptical to just kinda mix it up and about 17-24 minutes into it my TOES are NUMB!  Now when I'm on it, I just have to suck it up and take the discomfort (I switch from running and eliptical on a variable depending on week).

Has this happened to anybody else out there or am I just doing the Eliptical trainer terrribly wrong? I definitly am trying to bend my knees and not locking them as some friends have asked me.  Another friend of mine said its because I'm not taking it in a longer stride but what the HECK does that mean?  It's an eliptical, there's only so far it allows you to 'stride' since its fixed.

This is the only time something weird happens when I work out.  I don't have this problem at all while running for long periods of time....so whats your opinion?  Is there a possibility I might be doing it wrong?

I had previously thought there was something wrong with me:  my feet, my circulation, my shoes maybe.  Nice to know this is a common problem and there are several solutions.  I tried some of the above yesterday and they work.  I've also found bringing my feet off of the footpads in a stepping movement helps too.