Word to the Flash Genies-- Heres my wish that hopefully someone else is struggling with an enormously mind-boggling bug in flash cs3-- when I try to create a public class that extends any of the native flash display objects, and I put this in its own package, even after specifically importing the specific class OR the package wildcard .* the fla that I’m compiling returns error 1017-- Base Class Definition not found. The fla is set to the correct classpath. This situation slipped from ‘minor annoyance’ to ‘mind boggling’ after I moved the directory to a different pc with cs3, reset the local classpath and it compiled perfectly. So then I moved the directory to a mac, running flex builder, and made a tester file to use the class, which compiled perfectly. For some wierd reason, this particular computer cannot compile, even though nothing had changed in the actual class. Maybe it is important to note that this machine is running Vista (and perhaps should not be!)? Maybe it is important to note that the package is part of an SVN directory? Maybe it is important to note that after re-saving the same class file, changing only the class name (from BitmapSprite to BSprite) enabled it to compile on this machine, even though both the mac and other pc (running windows XP) could compile the class as BitmapSprite. I’m not sure if the name change or just re-saving allowed it to compile–but maybe it’s significant that the new named instance was not committed to svn. I’m posting this here with the feverish hope that I’m not the only one encountering this issue and someone may know what is happening! exhaustive searches point to no clues, so any pointers would be welcomed with enormous appreciation and eternal gratefulness.