I haven't tried it with Garland or Bartik, but I have followed the sub-theme directions for Seven and it worked fine. Could it actually be a failure in the Color module?
Nancy Injustice anywhere is a threat to justice everywhere. -- Dr. Martin L. King, Jr.
From: Roger
That's what I did in the first instance, it worked briefly then failed, Did not change anything. Strangely I could reproduce the failure each time using the same database. New database and the problem went away until I changed the colours, then same failure occurred. Fortunately it's a dev database so it doesn't matter if basic "stufff" gets lost.