I have recently discovered a bug in Flex 3 whilst loading multiple modules. As you may know I now build a pool of modules in my PureMVC Multicore applications and load them sequentially on application start up. I have found that the ModuleEvent.READY is not always firing on each module load when Flex is whipping through all the modules rapidly loading them.

https://bugs.adobe.com/jira/browse/SDK-14669

A work around I have implemented is use a simple counter to load the modules in the array i.e. _modulePool.getItemAt( counter ). When a module is loaded a notification is sent and the next module is loaded. This seems to be a very straight forward solution that is easy and more importantly works.

This bug is apparently fixed in Gumbo!