I cannot install any new theme to wordpress

Hi there,
After updating one of my websites to the latest wordpress version( i think it is version 3.1.2), I am no longer able to add any new theme.
I can upload and activate themes, but nothing is working. I get a blank page.
However, I can still install themes provided through the wordpress platform, and these work well.
I do not know where the problem lies, because I got some good themes which give a good ctr but cannot use them on that particular site. Has anyone experienced anything like that since updating wordpress?
thanks

I've had a few problems like that, I just ftp them into the themes folder and they work fine.

oxonbeef said:

I've had a few problems like that, I just ftp them into the themes folder and they work fine.

Click to expand...

Hi there,
Actually I always upload my themes via ftp and install them, but none of them are working:S
However, only themes which are available FREE via the wordpress platform work.
So i am confused if there is something wrong with the installation of wordpress or the current version of wordpress

Try adding the theme to your themes folder using FTP.

Use FTP.

Delete all uploaded themes using ftp or file manager(which are not working).
Reupload themes that you want to use.