I found that Safari issue to occur for about 5 months. But according to Apple it was in version of Safari that they considered 'beta' (even though I don't think it was). I use Safari to access my CCBill admin several times each day with no issue. I just recently moved over to the beat version of Safari 4 and have no issues there either. Give it another shot on Safari. I'm sure you have all your browser updates.
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