Without being able to actually inspect your layout, I would guess that the different printer drivers have different maximum printable area figures and thus just a few pixels difference in what will "fit" on a page is generating that extra page of output.
Enter layout mode, then use print set up to select your printer, page size and page orientation. Then look for dark vertical and horizonal lines that mark the size of the printable area for that specific printer driver. items to the right of the vertical line will not be printed. Items below the horizontal line will print on the next page. You may find that by making a very small adjustment to your layout, you can get this to print without the extra page.
Unfortunately in layout mode, all the page fits perfectly into an A4 sheet (the printable working area is 2" shorter than A4 sheet ) both selecting FS1010 laser or LX300 needle printers.
Also , switching to preview mode, all is displayed correctly on a single page, on both printers selection.
Now, it makes me think to an Epson LX300+ driver issue with windows7
The real problem is I have to print on predefinied A4 paper modules.......
Any other suggestion ???
I would still try reducing the size of one layout part by a few pixels to see if it makes a difference. There are other possibilities but that still is a possibility. Can't tell if other possible issues might be in play without knowing a lot more about your layouts.
Do you have sliding fields on this layout set to reduce the size of the enclosing part? Do you also have sub summary layout parts on the layout?