Flash wants you to be safe, which means a swf you make cannot access the network (not even localhost!) and read local files. This can be a pain when you have a swf file you trust (e.g. when you wrote it yourself)! But the bigger pain is how badly Adobe document the workaround, especially if you are on linux.
First the answer. As root, make /etc/adobe/FlashPlayerTrust/. Then if your trusted swf, and its files are in /home/georgebush/killforoil/ you make a file called:
and in that cfg file you put this line:
George is now able to continue to screw the world without those Adobe do-gooders getting in his way.
Adobe document this (for Windows/Mac) here:
(Why am I saying the document it so badly? Because everywhere else I looked, they say using use-network=true when you make your swf file means it can never access local files.)
Once I knew that FlashPlayerTrust was the key word, I was able to find these linux instructions (which also tell you how to do per-user configurations):