The send button is hidden in the native text messager/email (i.e not manilas). The send button is really just the button to the right of the start button, it just looks blank.(i.e its a raised button but has no words). Could also be an issue with the sys, but I'd start there..
if that doesnt work it try this..
http://forum.xda-developers.com/show...postcount=4644
I don't have this issue using calks kitchen though.. (aside from the blank send button)