I have a new challenge...
After upgrading to SS 2.4.3 everything seemed okay, i did nt have the HTTP Error anymore, but ...
I also have some ImageUploadFields, the strange thing is that they are working if i use ModelAdmin, but if i manage my objects in the Page i only get a textfield showing the Image ID. No Uploadify what so ever. I had to change the parameters in my ImageUploadField from
<CODE> new ImageUploadField('Photo', 'Foto',Null,Null,Null,'SomeImagePage/Images') </CODE>
<CODE> new ImageUploadField('Photo', 'Foto') </CODE>
Because i got an error concerning Uploadify when i tried to open my (Object)page for editing.