1 person found this helpful
I've had similar problems. I've found that the Flash CC file sometimes loses the reference to the document class file and that the source paths in the Actionscript settings are gone when re-opening a file. If I re-enter the document class (and paths) in the Actionscript Settings dialogue it will reconnect with Flash Builder.
Could you please share the project files that you are using so that we can reproduce the issue on our side.
Unfortunately, this is client work that cannot be shared publicly. If, however, we could setup a screenshare or some way of "sitting down" together to examine the files, I should be able to work with you to review what I have.