Theme messes with adminpanel

Hi everyone,

I’ve been working on a theme on localhost, through WAMP. The theme worked just fine and did everything it needed to do.

I was making this theme for a client, who provided me with logincredentials to upload the theme. So, I made a .zip of my theme and installed it into WordPress. But the theme won’t work properly. Everything is displayed as it should, but this is what goes wrong:

* If I try to edit / make a post, page, add an image or change the theme and click Submit, the theme DOES do what it’s told to do (such as: save the post), but it shows a white screen.
* When I click on a post, my theme is supposed to show the content of this post. I made a function for this in jQuery. Instead of showing the post, it completely reloads the page WITHIN the same page – so I have two headers and two footers.

The theme is for the client only, so I cannot upload it. I made it basically from scratch. The only problem I can think up is functions.php, but when I use the functions.php from another theme, it still doesn’t work. I’m also not sure if the described problems are caused by just one thing.

My client is now waiting for me to fix this, but I have no idea what to do… did I forget to put something obvious into my code or does the problem go a bit further than just that?

Thanks in advance,
Famke