Blog won't show full text automatically

Hi,

I’d like my full posts to show, rather than just an excerpt/summary and the read more options, yet even though I have selected the option under the reading settings for the full next to be displayed, it still only shows a summary! I can’t figure this out at all, and can’t find any previous mention of this issue. Does anyone know what the problem is, and how to fix it?!

Thanks,

Beth