It seems that at least some of the red LEDs installed on the first batch
of robostix are mismarked so that they were installed backwards.
Fixing this requires soldering to remove and replace the part. I put up
some pictures on the gumstix.org WIKI:
Dave Hyland's simple flasher application is now operating as expected on
my robostix. Thanks Dave.
P.S. sorry about the name. I got carried away and then found out that
this WIKI's rename is well hidden :(