Is there any issues with rastering in laserweb 2 with smoothie.

Is there any issues with rastering in laserweb 2 with smoothie.

I uploaded a jpg image generated gcode at 14% power, but when I run the gcode , machine isn’t even moving . I tried to disconnect the machine but couldn’t, refreshed browser, still machine couldn’t get connected.
I closed the tab, opened laserweb tried to connect again, got a message in side widow that “COM4 is already open”

I’d to close the laserweb and JSON server to get it connected.

Tried several times, but same result always and can’t raster either.

Which buffer should I select for smoothie,default???
Also is there any way to control number of passes when cutting?

link to gcode https://drive.google.com/open?id=0B5_IWI68ZqZTLU1RYXBsN29Cc28

+Peter van der Walt what about number of passes?
In laserweb one I could do it by setting thickness of meterial (I think)