As reported here /163/3e/90762/1.html#post912940 every prim shoe in SL may soon become unsightly (or sightly as the case may be).
I guess we always knew this was kind of a bug, but a benevolent one. This could be pretty detrimental to many designers (me inlcuded). I guess we will all have to start using built in poses in our shoes and hope they don't conflict with peoples AOs.