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Many of us where getting them awhile ago and there is post somewhere....to me it appers and still happens some times when the system gets lost somewhere...as in if I press back to get to a block options page, i was on and then press submit a second time with out letting XOOPS catch up 1st, it shows that warning...its on comments that I don't like that happening..
still unsure my self what causes it, i am just careful to make sure the sites cache is refreshed...