Just to clarify your point, OpenLP certainly does scale to the vertical dimension of the screen resolution. It does not stretch, however, which would make percentages problematic when the aspect ratio changes, as you note. Even so, I believe percentages are still preferable to pixels. Text may spill over the edge or be constrained too tightly, depending on which way the ratio changes, but it will only affect the horizontal dimension. Percentages still assure centering or left/right biasing, so I do not see an obvious disadvantage.<br><br>The biggest drawback to pixels is that editing on the final projector screen, which surely is seldom identical in resolution to the primary screen, would presumably be a rare practice for service preparation. I prefer to prepare my services at home, then take the finished project to church, but that approach requires reworking themes to get pixel alignment right.<br><br>There is a simple, portable solution to the aspect problem: anchor the percentages to the background image proportions, not the screen resolution. This could be the default behavior when background images are selected or could be offered as a checkbox option.<br><br>One other point worth adding is that percentages are much more intuitive than pixels. Question: what is the span in pixels of a 1366x768 screen with 57 pixel margins on each edge? Answer: annoying.<br>