Here's one more, I wish I'd read this thread sooner, but until early this week I hadn't had any trouble with DH. This time I made an 8" and 3" deep pan enhanced and pudding added to use for a purse cake. (Mixed two of them and made some smaller cakes at the same time.) I thought it would never bake! At one point the top (which had risen about an inch above the pan) was starting to burn, so I cut that off, turned the oven down a little more, and put it back in...another 20 minutes later it wasn't much better, still gooey in the middle. As a last resort, I turned the whole thing into another pan, left them together and put them back in the oven, after a while it looked as if it was finally getting done...I just turned off the oven and left it in there. When I finally took it out and turned it out of the pans, it still was sinking a little and looked rather fudgey, but was edible, so I went ahead and made my purse out of it (it is for a family BD), but I felt like I'd run a marathon trying to get the cake cooked! The smaller cakes cooked all right, but were very dry, even with the extenders in them.
My thoughts were that I'd made the batter too thick, and then the 3" pan is harder to bake through, but now I have to think the mixes were not quite right either.
Maybe we will have to set up a boycott of DH, just to get their attention. Sorry this was so long. Janice