I don't think there is one. Though I have come across one bug with it. when in the materials editor and your using two channels with 2D pics, if you turn hte 1st one into the generic 'leo' then go into the picture editor to change it, the go to do the 2nd one, it'll crash. You need to turn both to leo, before going into the 2D picture editor to change them to the ones you want.