I'm using foobar2000 0.9 beta 13 under Windows XP. If I open an audio from the Internet (in browser's cache) it will play. Next time I try to open it from foobar2000, if the file is not present anymore, a playback error windows will open with the following error: "Unable to open item for playback (Object Not Found)". But if I close the window it will open again. I have to close the program to remove the error window.

What playback mode are you using? Are there other files in your playlist?

I'm using Repeat (Track) mode and there are any more files. No bug Sorry.