App built w/ Apache FLEX 4.9+ w/ dynamic RSLs hangs at startup?

We tried to upgrade from Adobe FLEX 4.6 to Apache FLEX (4.9 or later), and because our app is dynamically linked with RSLs, it frequently hangs immediately after downloading the RSL policy file (i.e.https://fpdownload.adobe.com/pub/swz/crossdomain.xml ). Our immediate solution is to downgrade back to Adobe FLEX 4.6. My questions are:

• Is it possible to troubleshoot this, and if so, how? Please note that some users can reproduce this easily, and others (like me) can't reproduce it at all.
• Since Apache FLEX SDKs do not contain the optimized RSLs (SWZ), has anyone else used any of the Apache FLEX SDKs (4.9+) w/ dynamic linking and unoptimized RSLs (SWFs)?
• Is there much if any benefit to dynamically link if the RSLs are not cached? The Apache FLEX FAQ says this: "There are a few differences you should be aware of in the Apache version of the SDK. Most notably, the Flash Player will not cache RSLs created with Apache Flex. You can find out more in the RELEASE_NOTES file in your SDK download"

Thanks for any answers!

Chuck Doucette