GadgetGuy,
Sorry, I've got no silver bullets, but "several thousand" can slow down the reader even if they're all okay.
If you're convinced it's locked up as opposed to slow, have you considered a binary search to find the troublemaker?
Load half your list and check - locked up or not - you've cut your suspect list in half. repeat with the remaining suspects. 10 iterations will sort through a thousand. you might still have several troublemakers, but you've found one and can determine why.
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