When working on several AS3 projects that share a common code base, FlashBuilder seems to be losing workspace data when switching from one project to the next. I will often get a message that such class could not be found , when the class is actually in the path but was probably modified in the previous project.
To fix this error, I find myself having to remove the external library folder , restart FB, then re-add the library folder and all is well.
Please tell me there's another way to "refresh" FB's workspace ! Have you experienced anything similar? If yes, how do you avoid this problem?
Did you try a clean on the project?
project -> clean
You could also try to clean your workspace. In windows for example, just add -clean after the link to the exe.
Update:
on a mac, try this: http://www.brooksandrus.com/blog/2007/06/30/run-eclipse-from-the-command-line-on-os-x/