Asheroth

I logged in last night with the same avatar I have been using for a while but my avatar is now missing a leg showing a triangle instead before it fades. Not really sure what the error is called but just wondering if there are any fixes with this problem because it doesnt show the leg that is missing not only for me but for every avatar that is using that mesh body for me but my friends can see them just fine.  would very much appreciate hel in this matter as my friend has problem with other mesh parts as well.