One of the nib files in my program has stopped displaying when loaded.
In desperation, I've tried rebuilding it from the ground up. When I first created the new file, with a xib dressed up with the labels and text fields, but without any code in the .h or .m (other than the starting defaults) that .xib would display. Once I cut and paste the old code into the .h & .m files, the new .xib no longer displayed. I commented all the new code out. It displayed the .xib again. I started selectively uncommenting a few lines to track down the line that killed it. It stopped displaying. I commented those lines back out. It still won't display.
What can cause this strange behavior?