I've tested it using both lenny and squeeze versions of libx11-6. Only downgrading to libx11-6 from etch allows some applications (as java apps) run in an usable way.
Maybe this info can help: https://bugs.launchpad.net/ubuntu/+source/libxcb/+bug/277069 and http://bugs.freedesktop.org/show_bug.cgi?id=17868 say that the problems appeared since libx11-6 was linked with xcb. This problem is very important for Debian Edu users. Up to now, the only workaround is downgrading to the etch library. Regards José L.
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