ICal 5.0.1; does the import have a file size limitation?

Question

I have been importing events into iCal using files with over 5000 lines. With Mac OSX Lion the iCal import creates multiple copies of each event. These multiple copies of events are not created if the the file size is reduced to 600 lines. If the file with 5000 lines is split into nine separate files of less than 600 lines each then those nine files can be successfully imported without the multiple copies of events. Is this a bug with iCal 5.0.1 or have the iCalendar file formats changed? I tried changing the line with the PRODID to this:
PRODID:-//Apple Inc.//iCal 5.0.1//EN
but that does not help.
Are there work arounds without having to split the large file into smaller files? Or is this a bug? New feature?

Answer 1

Thanks for the input
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Nathan