I've established the range of broken versions:
Construct 2 r66, released November 7th 2011 (introduced the Web Audio API)
Construct 2 r121, released March 5th 2013 (updated to new method names)
So anything exported using r66-r121 is now broken, notably anything exported during 2012. I've updated the OP.
Probably best to re-export anything old anyway.
Specifications can change in hidden ways, and the game engine is being constantly improved.
That any the latest game engine uses a newer version of jquery.
I suggest re-exporting every four months.