System freezes when running matchbox

Hello,

I'm planning to use matchbox for my embedded system.  I've got
libmatchbox 1.7, desktop 0.9.1, window manager 0.9.5 and panel
0.9.2.  It works fine on my Pentium III system with Fedora Core3.
However, on my VIA C3 Nehmiah with Fedora Core 3, it freezes
the system in about one hour time.  I eliminated all other applications
on the system, just run matchbox and the system would lock up in
one hour.

I thought it might be a hardware issue, but the same system runs fine
for days with X (XFree85 4.5) alone.  I also try other window manager
such as twm and it works fine.

I really like matchbox for its idea of PDA like, but currently I can't go
any further until this problem is resolved.  I don't know where to begin
to debug the problem, any hint and clue would be appreciated.

TIA

Dzuy