Hi, I'm having trouble with 0.4.11 and specifically with the AudioFileProcessor Plugin.  Sound works fine until that plugin is opened and a file is used, then there is no sound.  That is, I can open any plugin and use it fine, until I open the AudioFileProcessor plugin.  I ran GDB and nothing interesting came up when this problem was encountered.  More so, the green light next to the volume and pan buttons on the track lights up yet no sound, and there is a waveform on the plugin display.  This might be a problem on my machine if nobody else has encountered it.  I just thought I should report it if it is a problem with LMMS. 

Thank you, 
Jeff Ohrstrom