Xinerama in general seems to be having problems in Lucid, which is perhaps not *too* surprising as it's been deprecated upstream for some time.
Bug #572113 and bug #572192 are similar bugs in Xinerama, and I think the upstream bug https://bugs.freedesktop.org/show_bug.cgi?id=25166 is likely to be related.
Xinerama in general seems to be having problems in Lucid, which is perhaps not *too* surprising as it's been deprecated upstream for some time.
Bug #572113 and bug #572192 are similar bugs in Xinerama, and I think the upstream bug https:/ /bugs.freedeskt op.org/ show_bug. cgi?id= 25166 is likely to be related.