Hmm, I’ll try to explain that..
Starting point was the Warning with the GD/Zlib in after updating.
My provider offers different flavours/compilations of php.
I then tried the 5.3.0 in the hope that the mentioned libraries
are part of that php compilation.
The phph.ini for my server has by default magic quotes on.
First thing was, that I ran into trouble with tinymce, which
adds additional backslashes to links etc. I then turned magic
quotes off, as the tinymce manual mentioned.
After that (with 5.3.0 AND magic quotes off) the backend
produces dozends of error messages all pointing to
line 1768 of manager/includes/document.parser.class.inc.php
After that I switched back to 5.2.3 and magic quotes set to ON.
No error messages but still the two warnings, which I will ignore
as long as I do not rely on.
(sry for the ’englisch’

)