at my webspace i have several serendipity installations for me and some of my friends. a few days ago i installed a new one (version 1.0.1) which works fine so far.
the only (and very strange) problem is, that only some people can comment entries and others can't. if they click the submit button, the page reloads without an error, the comment form is there again and the comment isn't submitted. those people _can_ comment on another serendipity installation (version 1.0.0) on the same server. i suspected the antispam-plugin and removed it, with no luck. same problem remains. this is independent of the browser they're using and i have no more ideas where to start searching.
any hints?
thanks in advance
update: after some more investigation i found, that the problem is a redirect from another domain. the original domain makes a hidden redirect to the subdomain, where serendipity hangs around. i activated the automatic hostname detection in the s9y-configuration, but this doesn't help.
update 2: changing the kind of redirecting the domain to inline/frame redirection solved this problem.