manues214 on "Page editing box empty"

Hello guys,

Today I successfully installed WordPress on my server after using WordPress via WordPress.com.

Unfortunately I noticed that the page or article editing box doesn't show what I'm typing.
Does anyone have the same problem? How do I fix this?

Here are some pictures:
https://www.dropbox.com/s/3qj4u32paiz4tve/Bildschirmfoto%202013-06-24%20um%2022.27.35.png

only when selected the text is visible
https://www.dropbox.com/s/wzm373g3usbshud/Bildschirmfoto%202013-06-24%20um%2022.27.45.png