To reproduce, go to the standalone HTML sample page in Blackberry from the ICEmobilespring application. Record an audio file, then upload. When you click on the return link, you'll get a 404 error and no page is displayed.

The requests from the client are

[6.4552 11:33:03.309s] -- GET /icemobilespring/resources/media/clip.mp4 HTTP/1.1
[17.625 11:33:14.479s] -- POST /icemobilespring/jsonmic HTTP/1.1
[17.783 11:33:14.637s] -- 1`!a-%A0<HF��J���h�J�D[��0?�f�9��<B&���Jw���5DP���
[22.390 11:33:19.244s] -- GET /icemobilespring/#icehtml HTTP/1.1
[22.917 11:33:19.771s] -- GET /favicon.ico HTTP/1.1


The responses are:

6.4677 11:33:03.321s] HTTP/1.1 404 Not Found
[18.115 11:33:14.969s] HTTP/1.1 200 OK
[22.400 11:33:19.254s] HTTP/1.1 404 Not Found
[22.919 11:33:19.773s] HTTP/1.1 200 OK

(as an aside clip.mp4 is also not found, but that is missing for all devices and doesn't harm any other devices)

But this request is the one that fails:
 GET /icemobilespring/#icehtml HTTP/1.1