Help with Latex: Delta O Squared Error

[LostConjugate]

Seems like no matter what laytex code I type in, I get the same result delta O squared. Strange. Even if I type \sigma

$$\sigma$$

Edit. Oh. Looks like its only in preview that it shows up wrong. Why is that?

latex that is :)

 

[Lord Crc]

I've had some issues with my browser incorrectly caching the images during preview. If I paste the preview image url in another browser I get the correct image. I'm guessing there's a setting that's wrong. In any case I think this fits better in another forum but that's just me :)

 

[LostConjugate]

$$\Delta$$ Oh yea works in IE. Thanks.

 

[tiny-tim]

Also works if you press "refresh" (as opposed to pressing "Preview" again).