More than likely, the Vericolor is a bit thicker than FP4, thus making it more difficult to fit under the retaining slots on each edge. I have found that with age, sometimes film holders can build up debris under the long slots, and the film will not slide in easily. You can take a business card or wasted sheet of film, and run this thru the slots to clean them out. If your film buckles out, then it can catch on the darkslide and at the least become scratched when you replace the darkslide, and worst-case the dark slide will actually push the film out and you will have wasted a sheet.
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