I (still) have the problem that I don't get FakeCD CD art for every music album. I tried the 156 beta but without any success. As you can see in my logfile it doesn't try to call FakeCD if it hasn't found a CD art (not as shown in your thread).
In some cases it calls FakeCD and creates CD art. But in those cases it's not a "404 NOT FOUND" but it just says "no fanart.tv CD picture ...".
I do have album covers for the missing songs. I don't know if I'm doing something worng. This is the log from my test system but I do have the same problems with my "big system", too,