strategy tester skipping data

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I was using the strategy tester to optimize an ea. Suddenly it is skipping data and only using data for Mondays (if it uses anything at all).....I've reloaded the data, tried different dates to test,tried different ea's, reset my computer, tried different brokers platforms...still it skips data. This problem started with the upgrade to build 222 quickly followed by build 223. Every thing else seems to work fine. My operating system is XP. Any ideas about the problem?