I started another thread about this just last week (sorry, couldn't find this one):
http://forums.dpreview.com/forums/read.asp?forum=1015&message=17881012
All my settings and tests are fully described there, but my conclusion is that in snapshot mode, without the flash firing, 38mm (wide) zoom shots all come out blurred.
I took 10 photos at different distances from a nice high contrast, static subject, first at 38mm then at 46mm equivalent (next step up). All the 38mm ones are blurred, all the 46mm ones are sharp.
It's not due to moving the zoom because I was doing plenty of that during my tests, I wasn't especially nervous on the shutter button either (if it had been an issue, the 5 sharp images would have been blurred)
Your sharp photos, did you zoom in slightly? That information is included on the EXIF.
Casio UK are looking into this for me, I think I'll email them this thread, they said they'd get back to me on Monday.
Other 750 owners out there, could you possibly do a similar test, to see if this is a chronic problem or limited to an unlucky few? TIA!