I have the same problem here and I am using the 2007/09/30 build of aros.
Rule of thumb when using AROS Nightlies (untill one of the three new AROS distros sees the light of day that is), if it doesn't work, try a couple of builds later. AROS Nightlies are very raw work and often fail to build because of recent submits. Right now there are ALOT of commits going in for various projects wrapping up so it's not unusual for bugs to come streaming out of the woodwork with nightlies.
Velocity Distro is due out Oct 31st, keep your fingers crossed.
Dammy