I've been fighting this for a couple of hours now and have not yet found a solution. I have a rather large .eps figure inserted in a float. I set the width to 80% of the text width and the paragraph justification to center.
When I preview the page using ctrl-x, ctrl-p I see the figure propertly displayed (it's rotated 90 degrees so the 'top' is just above the '1' in Figure 1 and the 'bottom' is just within the right page edge.) After exporting via pdflatex, when I view the page (xpdf, epdfview, acroread) the figure has shifted slightly to the right so the 'bottom' is truncated. I've not seen this behavior before. I'm running lyx-2.0 on slackware-13.1. I can send the file, the .eps figure, or whatever would help determine why it's fighting me so hard. Help really appreciated, Rich
