I just setup the latest 4.1.1 maemo SDK on Ubuntu 8.10, and Xephyr doesn't seem to want to run -

Xephyr :2 -host-cursor -screen 800x480x16 -dpi 96 -ac -extension Composite
*** glibc detected *** Xephyr: double free or corruption (!prev): 0x0981a3c0 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb7c0e3f4]
/lib/tls/i686/cmov/libc.so.6(cfree+0x96)[0xb7c10456]
Xephyr(Xfree+0x21)[0x81d7cf1]
Xephyr[0x80bcc52]
...

Any thoughts on what's wrong or a workaround?