Reading
this page on HackMii as well as
this one makes it seem less and less like the update was a total and 100% bad thing.
More like 99.999% bad, but you get the point. :P
But, to answer your question: No. 3.3 or 3.4 did not screw with Yaosm3 at all. Your discs may be affected though, if they were signed by Trucha.