I'm having the same problem...
I started a new thread last night about the problem I am having not realizing that this thread had already been started.
I am having the exact same problem as hmseb and I am not in Canada, I'm in the US using Verizon Fios as an ISP. I'm using the 1 pixel out audio player and every time it's clicked it says "file not found"; however, the file is there, it's verified successfully, and it works just fine when you put the url in the browser to download.
It's going on 2 days now with this problem so it makes me wonder if it is really the ISP. What else could it possibly be?