How to export a slide style to .pxs

When importing a style in .sta format, it does not work at all.  The only styles that work are .pxs.  All .sta styles cause Photopia to not respond (crash)

All our video tributes are identical except for the first slide which is a slide I designed and exported as a .pxs about three years ago.  Now, that slide is currupted and I cannot create another one.  The only option I have to save the style is .sta but as I said, .sta's cause Photopia to crash.

How do export to .pxs??  We do hundreds of tributes per year and now we are at a stand-still due to Photopia not responding and crashing all the time.