Having problems with saving products

Hi,

I am having problems with saving products. What I enter in description fields, or in Meta tag fields is not saved correctly. Instead some other code is added and saved.

Same happens with adding images to a product, the ticked options are not saved and other fields in the product are changed and filled with strange code.

What could cause this to happen? I have done various Magento Installations and this is the first time something like this happens…

Thanks,
Ron