I don't know much about the current state of sponorships. I self sponsor everything I make. You can check out FGL.com for more opportunities, sometimes people on
talkarcades.com like to sponsor as well.
The 2 issues with flash sponsorship that I see when using flambe are the assets aren't embedded and the game requires wmode=direct. The embedded option is solvable, but the stage3d I'm not sure about as I just started looking into this engine.
The reason stage3d isn't the greatest for web model sponsoring of flash games is because most portals don't have wmode=direct set which results in your game not working there. Great for mobile versions of the game though.
What platform are you working on?
The most likely problem is the new neko binary to put the assets into the swf.
I'm working on windows and this is the new command that was run during the build process:
neko C:\Users\ss2\AppData\Roaming\npm\node_modules\flambe/../bin/hxswfml.n xml2lib build/.cache/swf/hxswfml_asset_lib_def.xml libs/library.swf
Now, what happened with me is there was no directory C:\Users\ss2\AppData\Roaming\npm\node_modules\flambe/../bin/
So I added it and put hxswfml.n in there. Then it ran and worked. You could also find index.js and look for this line:
var BIN_DIR = __dirname + "/../bin/";
Then you could adjust where that bin dir resides.
__dirname is setup by npm and is the current directory where the running script resides (index.js) so you can't adjust that.
Perhaps that's your issue as well?