M4V no longer working on iPhone

I work for a software company and do the video tutorials. I always export a .MOV version and export an iPhone version using QuickTime's export features. Before the .M4V versions always worked on iPhone, but they no longer work. Not on iOS 4 or iOS 3. However, .MOV files that were exported with a size suitable for the iPhone do work. Can anybody help me with this?

From iPhone tech specs:
Video formats supported: H.264 video up to 720p, 30 frames per second, Main Profile level 3.1 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; MPEG-4 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps per channel, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; Motion JPEG (M-JPEG) up to 35 Mbps, 1280 by 720 pixels, 30 frames per second, audio in ulaw, PCM stereo audio in .avi file format

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