Originally Posted by
Frank Snyder
Ray - More likely the Poplar did the warping. I've had this happen to me as well when using 1/4" plywood for the panels with Poplar door frames. For the last Poplar door frame project I did, I used 1/2" Baltic Birch with a rabbet edge for the panels which are more substantial and seem to keep the Poplar frames from doing their thing. I also added magnetic stops to keep the inset doors in place. So far, no warping.
Don't beat yourself up...this sort of thing comes with the territory.;)