Yeah we had a myriad of problems with this feature, especially with loading SWFs (as Modules) within our main SWF (the subordinate SWFs would randomly fail to load).

Tried everything we could think of. Eventually gave up and reverted back to our fat but reliable non-RSL version.

Apparently RSLs don’t work well on Linux…
You can put this in the “ugly” .

We just launched a new version of our site, based on RSLs and all our Linux users are pretty unhappy.
There is workaround explained in the bug page comments (flashlibsupport installation), but you must have some good Linux knowledges.

It looks like this issue is not solved in the current beta of Flash Player10.

I really like the idea behind this RSL, I also used it on a projet recently, the only problem I’ve been facing was with linux (my OS at home), the RSL “loading process” makes flashplayer crash (with fp < 10), although this doesn’t affect most people, it would be cool if this was fixed