Pages won't always update

[herronial]

I run a website, and recently I have noticed that i'm having a few problems with the browser displaying the updated information.

My website use to be coded using basic html, i have now switched to Dreamweaver (not sure whether Dreamweaver is the cause of the problem, but does seem a coincidence)

When i change a page and upload it, it usually displays the new information straight away, however occasionally it won't and i will have to click refresh (sometimes twice). An annoying problem as some people have been complaing that their info hasn't been updated, when it has.

I always use the same process of uploading so i can't think what it could be. Any ideas?

Thanks in advance.