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: The hint about SearchFriendlyURLs is just a workaround, which
: should work on public side. On admin it will not resolve the
: server-side issue. The solution is to remove the filter for
: "id" attributes in URLs .... at least for the folder
: in which the entry scripts are sitting.

Depending on how exactly your host configured the server, the following may or may not help:

IF the host uses mod_security on Apache to filter URLs
AND you're allowed to overwrite mod_security settings
you MAY be able to turn the filter engine off by creating a .htaccess file in the same folder where the admin entry script sits (alongside) and add the following line(s) to the .htaccess file:

# disable mod_security
SecFilterEngine Off

As mentioned this may or may not help. If it does, you may optimize what makes sense on your server.

Either case, it would be nice to hear if it's working or not.

Rainer