+1 same bug for me. I am getting random cut-out's too, if I have more than 1 sound block requesting a sound. Background music is now impossible.
In the past I was informed they do not test for or deal with Windows 7 problems. (I guess the FREE developer versions of windows 7 are too expensive)
If this is true, you are pretty much wasting your time with Construct 2 + Win 7 development.
If you find any "Show-stopper" bugs, they will be ignored unless they can can re-create them in windows 8.
The Node-Webkit Drag and drop is broken too, even worse than before. If you drop an EXE file on the window it will open the save dialog.
If you drop any file type Chrome understands like Jpeg or txt files, Chrome will load the files into the browser window rather than executing your commands.
The preview mode does not do this, so it is probably a fixable bug.
You can get a Dev copy of windows 8 for free. You can probably run it in a VM. If you do not have the same bugs when you test in windows 8, then it is time to give up developing for windows 7.
They will not be able to re-create or fix the bug.