I think there is some evidence that the iRex pdf reader is somewhat flaky about recovering from resource limitations. I have had some pdfs return to the contentlister also, without giving any error indications.
As an acid test try loading the Adobe PDF Reference version 1.7 (available on their web site). It's about 30M. When I try to read it the first page comes up, but after advancing through the table of contents, the Iliad activity light comes on and stays on indefinitely. (I was recharging, so I let it run for several hours for fun). Apparently the reader had gone into a loop and was unresponsive to further button pressing. Time to reset and reboot.
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