Marina, when u try to work with out the encoder, in order to select ur camera, u go on the picture area where u should see urself on SM chat window and do right click with mouse, there u get Adobe Flash Player settings window, u go 'Settings' option and choose from next small window ur camera, microphone, whatever else, also tick the boxes of 'remember' the setting and 'permit', u have a few tabs available, just look around all of them. i try to take a screenshot for u here.
Attachment 32951
Attachment 32952
Edited to add: this procedure is working on ANY flash player based sites (they all like this i think), just go right click on the black screen where ur picture should come up and select what u need. Good luck!