This is so odd that I had to post it, and still cannot find out "why." I got a new acoustic guitar and recorded a track, then added GR5 (Guitar Rig 5)on it as an effect (done this before many times, and with an acoustic is almost needed to prevent feedback). When enabled, GR5 mutes the track (no output, and no meteres moving on GR5 either)! GR4 works fine... GR5 works fine in stand-alone mode... and previous projects with GR5 in it are also fine! I deleted the GR5 effect, rescanned VSTs, inserted GR5 again... and still no sound with GR5 "on." Checked all settings I could think of, and still nothing. The only thing I could think of is I had switched X2 to WDM mode, so switched that back (it was in WDM when recorded)... the stand-alone of GR5 is ASIO. Deleted/readded GR5 after this, and still nothing. Any ideas on why this is happening? Is almost like a setting of GR5 is not working correctly, like it is getting "no input."