This may be a bug report for Adobe, but thought I'd ask here for workarounds...
When I create a new Flex Library Project, a .swc is automatically created in the /bin folder. When I add a new class, the .swc is updated (I can tell by looking at the 'last modified' timestamp of the .swc). When I edit that class, the .swc is also updated. This is all as expected, since Project > Build Automatically is checked.
However, as soon as I paste in other classes, I can no longer update the .swc. The datestamp does not change, no matter what edits I perform. Unchecking and re-checking Project>Build Automatically does nothing. Even worse, Project>Clean deletes the .swc file, and I cannot recreate it!
Is there any way to force Flex Builder to build a .swc?