due to some issues I decided to try a new wordpress theme, I'm very happy with it so far, but am running into one issue, when you click the recent post button, the pop up shows behind the menu and the forum content, if I scroll all the way to the footer, it shows fine, this is on my staging server, not live, any ideas? Thank-you

It sounds like your theme may have a z-index value for the menu that is greater than the popup. Not unusual but it would need to be analized to see what the exact problem is.
Do you know how to check the CSS for the different areas to diagnose?

would that just be in the style.css? One thing that is weird though, if I click on the my profile, then click on new posts, it shows up fine

Brandon was probably meaning the CSS for the Simple:Press theme you are using. If you locate the CSS for the .ui-dialog class you could try putting a z-index on that.

is there any documentation in the codex I can follow along for that yellow?

okay this strange, it only happens on the main forum page, if I am on a subforum, profile ect, it works fine

What, perhaps, you should be doing is checking to see what styling is being applied as then we will know where to correct things if needed. So - do you know, by any chance, how to use the web console that comes with your browser? And if so do you know how to inspect elements and look at the CSS being applied to them? (Where you can also change the CSS to see the effect)

yes, I know how to inspect elements, just trying to find the right one

The outer container of the popups is a class of ui-dialog

after testing further, I found some other issues, so I reverted back to my old theme, and now there is no pop up at all on the main forum page, can I have one of you take a look and see what you think? Thank-you.