Content displays, then rearranges on page loads.

Pages in my app seem to load in stages: the content all appears but with the header and footer bars clearly not taken into account, then the padding gets changed and the content shows up in the right place.

For context, I'm usually building the content of any given page during pagebeforeshow.

If this tweaks any memories, please let me know. It would be difficult to create an accurate jsfiddle for this particular problem.