Flvplayback seekbar doesn't work

I’m using the standard flvplayback component v.2.5.0.26

When I load a flv file in it, all UI buttons and buffering work correctly with the exception of the seekbar - when I drag the seekbar handle forward, the video doesn’t go to that position, after I release the handle, it jumps back to the beginning of the video and it keeps playing from there

Does anyone know if it happens because of the specific flv file or I need to add some AS3 code to the seekbar to make it work?