What version of v10 are (were) you running? There was a fix in one of the later versions that made it possible to open an MSP sheet on a computer with a different screen resolution and still get the correct layout. If you did not have that version of v10, then it is possible that the different screen resolution is messing things up.
To test this, you can change your current screen resolution to the same as you were running on the machine where the v10 file was last saved...all this is only if you have changed machines and/or monitors, naturally.
Another possibility, if you have changed to a different flavor of Windows -- this can affect the plotter driver and the area of the paper inside the margins. Believe it or not, the drivers for different versions of Windows are not consistent for the same plotter!
What plotter, and what Windows are you running, and were you running something else before with v10?
[Edit] I just thought of another possible cause: if you have a different list of scales in v11 than you you were using in v10 (I'm trying to remember if these are embedded in the drawing or not), then this could certainly throw off the MSP sheets! Are all the details off by the same number of steps in the scale?
AND AGAIN, YOU CAN TAKE OFF YOUR CAPS LOCK WHILE YOU ARE POSTING -- OTHERWISE IT MAKES IT SEEM LIKE YOU ARE SHOUTING!