Just to add my experiences with this advert problem.
Using XP, IE8 as I have done for several years I frequently find that the adverts do overwrite the posts, however its not consistent! some days its fine and other times I cannot read the posts. Oddly compatibility mode sometimes does help but very often. I have tried to investigate what causes the variability but so far without success.
As I understand it compatibility mode is provided by Microsoft to assist viewing websites that do not fully conform to the current standards/norm. That fact, and the fact that of the HUNDREDs of site I visit never have this problem leads me to the conclusion that the fault is of MHS making and not to do with what browser or computer we use.
I thank DC for fixing the examples that he is made aware of but I feel he has involved himself in a never ending (and thankless) task!
Ian