hi.
i've been working on a detailed model and found that when i select many edges and use the "edit>connect edges" command the program will add useless edges in between points that originally did not have an edge between them. e.g. i have two 4 sided faces sharing one edge, i select the top two and bottom two edges in the faces and use the connect edges command, which is supposed to subdivide the two selected edges opposite eachother in a face and put a line between them. when i use the command in the example i would end up with 4 four-sided faces, however unlike normal it will put a new line between the 2 new vertices that were created. that new line really messes up the flow of subdivided objects. another consequence of using the "connect-edges" tool is that the normals of the some of the faces are flipped, which is very annoying considering the detail of the model and the small faces and complex geometry.
i have been working on a subdivided model, don't know if that changes things.