Ok after looking over my CSS I discovered one descrepency which made the single post pages look odd. Then I figured out the positioning problem with the top curved thingy was caused because IE doesn’t support [element] > [sub element] (element direcly under the parent element) coding but does support [element] [sub element] (element somewhere under the parent element). I had to assign the image a class so that I could gain the desired effect. Now only the PNG bug remains, which I cannot fix so IE users get a real browser.
[end of transmission, stay tuned]