Ok, something strange is happening.
When I enable all 3 Flash thingies, Chrome automatically uses the PPAPI version, instead of the NPAPI version, which is normal.
When I disable PPAPI, it uses NPAPI, and on YouTube, the videos don't play.
HOWEVER, when I enable PPAPI, the YouTube videos play, but they play upside down...well, at least most of them.
Some work normally with PPAPI, but NONE of them work with NPAPI.