LPChip, a perfect analog to your response follows:
"Gosh, LPChip, I just can't seem to reach that shelf with the cream pie on it!"
"Obviously, Mr. Smith, the problem is that after you get the pie, you might have trouble eating it."
Although, honestly, I'm not sure what could be making this jump difficult. It is an ordinary four-tile jump (or five-tile, or three-tile, depending on how exactly you look at it. And the act of maximizing your jump height is hardly difficult - hold S until you reach the peak of your jump, then release it and immediately hold it again. This is to say, jump as high as you can then double jump as high as you can.
Perhaps, as you say, your version of the level/game is somehow corrupted, and has made that jump impossible - but the probably of this happening is extremely, extremely low.