I just ran through it and couldn't get it to appear about 50% of the time, so it's definately not fixed.
1) I will validate ... haven't gotten around to that. Either way, I really doubt that is the issue in this case.
2) Get rid of inline styling? No offense, but I'd have a very hard time believing you put EVERYTHING in your css file. I do agree with swapping out the pt usage.. but we've been around that block.
3) ... yeah, again, not sure this would fix anything.
4) not sure where that is being used but I'll look into it. I don't normally put the '' in there either but someone else suggested it so I was desperate. It doesn't seem to make it any worse.
And I'm not sure what you mean by "table layout coding concepts"... I haven't used a table for layout in close to 5 years. Maybe you can explain that one further?