I installed the "Square" preview last week to test it out. I then uninstalled it with the uninstaller specified on this page (http://labs.adobe.com/downloads/flashplayer10.html) and reinstalled FP 10.1.82.76 debugger. When I now debug SWFs with Flash Builder 4 with localhost, everything connects fine but when I try debugging directly to a SWF on my local machine (/Volumes/Work/some_path/Main.swf), I get the player can't connect issue.
I know the file exists and I didn't have any connections issues before installing "square". Any resolutions/ideas?