others have had that problem here and there, it is a blogger issue i believe and the issue comes and goes as well. good luck. others have suggested using Windows Live Writer to write your post and the import into blogger, lots less problems.
*please read*I would REALLY like to reply to your comment, but I can't unless you have your email address visible in your settings! Log into blogger on your dashboard page, click where it says "edit profile" on the left side of the page. Then check "SHOW EMAIL ADDRESS" in the 3rd line down, and at the bottom of the page click SAVE PROFILE!