Flash pictures too blue - optio 750z - help?

Since your EXIF shows WB as manual maybe the problem has been pinpointed. I just ran a series of tests consisting of 3 groups 6 shots each. The mode switch was at "P" and all other settings, other than WB, were at default or auto. Group 1 - auto flash Group 2 - forced flash in sunlight (incase the camera checked an EV threshold) Group 3 - flash off In each group I varied the WB starting at auto and ending at manual. The EXIF for group 1 and 2 all showed auto WB, group 3 showed auto WB as auto and all others as manual. So, any time my camera fires the flash the WB goes to auto.

It does look a little less warm than the Fuji image. Why is there so much apparent haze on the o750 image, it almost looks like your lens is smeary or something. Its particularly noticable on the flowers. Have you checked the exif data to verify if the WB is forced to AUTO. I would take a flash photo with WB set to some other setting and see what the exif comes out as. I will try this sometime on the o555 to see what it does. At the moment, I have no other ideas except there may be something wrong with it that needs repair.

I have an Optio 750z too. I find for indoor shots, I set up one of the User settings. In User 1 for indoor shots I increase colour, use spot metering, reduce flash comp, increase EV to +.3, set WB based on incandescant and a few other options. You will need to set it up for your needs . User 2 is set up for low res shots and battery saving when I go away camping and want postcard type shots. User 3 is set up sports shots (my kids)

Try playing with the exposure compensation lever. Turn it down a few notches when you use flash. I do that all the time to prevent over exposure Or you can set the flash compensation in the setup.