Well, I performed a factory reset, which resulted in F/W 4.3 .8842 being loaded on the ereader. I sent my Calibre library to the reader without making any changes in the driver options, and I was able to open and read all the large complete works kepubs. I then updated the F/W to 4.3 8966 and could still open and read them. So I don't know what was causing the problem previously, but it is now fixed...
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