I have had this exact problem on my web PC.
It has Win8.1
AMD six core CPU
Realtec on board sound
Splat
And the work around I found was the exact same thing, I had to save while leaving the CT in the FX bin then open project back up. Works as expected after that.
I would have never reported this as it happened on my home/web PC and not my music PC.
Just saying it has happened to me. And it was on buses, not regular tracks.
I can give more info if needed.