Safari on iPad has problem playing MP4s if it thinks it has a cached copy

This is a packet capture of an instance when an MP4 movie plays out in Safari on the iPad:
GET http://1.s3.amazonaws.com/1.mp4 HTTP/1.1
Host: 1.s3.amazonaws.com
User-Agent: Mozilla/5.0 (iPad; U; CPU OS 421 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5
Accept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/pn g,/;q=0.5
Accept-Language: en-us
Accept-Encoding: gzip, deflate
Connection: keep-alive
Proxy-Connection: keep-alive
HTTP/1.0 200 OK
x-amz-id-2: 5QhAFS6fvHTKzFnGR06ZVIZMx0/Npa7LbTpqZL/IKA2i/66/cbuMwuA8JQdATf
x-amz-request-id: F12FA7AB337CDDDB
Date: Tue, 21 Dec 2010 23:09:59 GMT
x-amz-meta-md5-hash: 27a69ce9609026e883f24bab474fb43e
Last-Modified: Mon, 29 Nov 2010 16:58:05 GMT
ETag: "27a69ce9609026e883f24bab474fb43e"
Accept-Ranges: bytes
Content-Type: video/mp4
Content-Length: 39528047
Server: AmazonS3
Connection: keep-alive
Proxy-Connection: keep-alive
GET http://1.s3.amazonaws.com/1.mp4 HTTP/1.1
Host: 1.s3.amazonaws.com
Range: bytes=0-1
Accept: /
Accept-Encoding: identity
Connection: keep-alive
User-Agent: AppleCoreMedia/1.0.0.8C148 (iPad; U; CPU OS 421 like Mac OS X; en_us)
Proxy-Connection: keep-alive
HTTP/1.0 206 Partial Content
x-amz-id-2: n7vKKunwCWZGdLy5od5nTUFUc+bp6dBV5BG5PjMS9Lqe0BFJIS3TAFRrJgIV3o68
x-amz-request-id: 7BB4FD6AC1F299B0
Date: Tue, 21 Dec 2010 23:10:00 GMT
x-amz-meta-md5-hash: 27a69ce9609026e883f24bab474fb43e
Last-Modified: Mon, 29 Nov 2010 16:58:05 GMT
ETag: "27a69ce9609026e883f24bab474fb43e"
Accept-Ranges: bytes
Content-Range: bytes 0-1/39528047
Content-Type: video/mp4
Content-Length: 2
Server: AmazonS3
Connection: keep-alive
Proxy-Connection: keep-alive
GET http://1.s3.amazonaws.com/1.mp4 HTTP/1.1
Host: 1.s3.amazonaws.com
Range: bytes=0-39528046
Accept: /
Accept-Encoding: identity
Connection: keep-alive
User-Agent: AppleCoreMedia/1.0.0.8C148 (iPad; U; CPU OS 421 like Mac OS X; en_us)
Proxy-Connection: keep-alive
HTTP/1.0 206 Partial Content
x-amz-id-2: r0O3sLqr3xPevFlVYaDnYzoBm4Sqkre73BbyNmHgF0gHA4vUxB/XreKxPOfUT2mY
x-amz-request-id: ADF5AD627BF658F8
Date: Tue, 21 Dec 2010 23:10:00 GMT
x-amz-meta-md5-hash: 27a69ce9609026e883f24bab474fb43e
Last-Modified: Mon, 29 Nov 2010 16:58:05 GMT
ETag: "27a69ce9609026e883f24bab474fb43e"
Accept-Ranges: bytes
Content-Range: bytes 0-39528046/39528047
Content-Type: video/mp4
Content-Length: 39528047
Server: AmazonS3
Connection: keep-alive
Proxy-Connection: keep-alive
This is a packet capture when a movie fails to play:
GET http://2.s3.amazonaws.com/2.mp4 HTTP/1.1
Host: 2.s3.amazonaws.com
User-Agent: Mozilla/5.0 (iPad; U; CPU OS 421 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5
Accept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/pn g,/;q=0.5
Accept-Language: en-us
Accept-Encoding: gzip, deflate
Connection: keep-alive
Proxy-Connection: keep-alive
HTTP/1.0 200 OK
x-amz-id-2: 20REtIp6hCFXDC2AkVLGTyNbrDAnEjrZQp1iMp4T6PHY7kyrXwkBtfMSiainhY
x-amz-request-id: 2BE016782AC16F0F
Date: Tue, 21 Dec 2010 23:14:30 GMT
Last-Modified: Tue, 30 Nov 2010 15:07:14 GMT
ETag: "9c2cfe7abdc0ad0b0ff173e7edcb13ec"
Accept-Ranges: bytes
Content-Type: video/mp4
Content-Length: 11660446
Server: AmazonS3
Connection: keep-alive
Proxy-Connection: keep-alive
GET http://2.s3.amazonaws.com/2.mp4 HTTP/1.1
Host: 2.s3.amazonaws.com
Range: bytes=0-1
Accept: /
Accept-Encoding: identity
Connection: keep-alive
User-Agent: AppleCoreMedia/1.0.0.8C148 (iPad; U; CPU OS 421 like Mac OS X; en_us)
If-Modified-Since: Tue, 30 Nov 2010 15:07:14 GMT
If-None-Match: "9c2cfe7abdc0ad0b0ff173e7edcb13ec"
Proxy-Connection: keep-alive
HTTP/1.0 304 Not Modified
x-amz-id-2: 89hVPJNDxUDdBlTufRKZhTUsJqghMad0l1msfxYtDvjO7mm2GSg0QTLYOMdovCtK
x-amz-request-id: E01D8F361061E50B
Date: Tue, 21 Dec 2010 23:14:30 GMT
Last-Modified: Tue, 30 Nov 2010 15:07:14 GMT
ETag: "9c2cfe7abdc0ad0b0ff173e7edcb13ec"
Server: AmazonS3
Connection: keep-alive
Proxy-Connection: keep-alive
GET http://2.s3.amazonaws.com/2.mp4 HTTP/1.1
Host: 2.s3.amazonaws.com
Range: bytes=0-11660445
Accept: /
Accept-Encoding: identity
Connection: keep-alive
User-Agent: AppleCoreMedia/1.0.0.8C148 (iPad; U; CPU OS 421 like Mac OS X; en_us)
Proxy-Connection: keep-alive
HTTP/1.0 206 Partial Content
x-amz-id-2: Eis7DCS0J1ZWeghfy4fLgSLc9CAtAeTMLnAfDbAXtioqxVNVLjXHd0KirxNDYLP9
x-amz-request-id: B32505FA1FEC1D8D
Date: Tue, 21 Dec 2010 23:14:31 GMT
Last-Modified: Tue, 30 Nov 2010 15:07:14 GMT
ETag: "9c2cfe7abdc0ad0b0ff173e7edcb13ec"
Accept-Ranges: bytes
Content-Range: bytes 0-11660445/11660446
Content-Type: video/mp4
Content-Length: 11660446
Server: AmazonS3
Connection: keep-alive
Proxy-Connection: keep-alive
These examples are from AmazonS3, but the same happens on Apache.
It looks like a problem with cacheing in Safari. The movie fails to play if Safari includes If-Modified-Since in the first byte range GET request and the server responds with a 304, Not Modified.
Has anyone encountered this problem and found a way to work around it?

I am not surprised at all by your reply!
I would do that, soon as I'm done with stretching/timing adjustment; thing was I was still 10 seconds from the end when it started acting up. But Just as a safe precaution in case it would do something like that I had already backed up a couple of times so thankfully I don't need to do it all over again!
So, you don't think that "set beat markers" (or something like that) can be locked to beats in MT? For example if I run the "Find and Mark" beats in EV and then use those beats to snap to the closest beat in MT, stretching the file as need be in order to get it there.. ? Maybe I'm dreaming out of this world.. Next time I'll have to force my clients to sing until they sing it dead on right!
Thanks for your response!

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