After choosing a file via a "Choose File" button (input type="file") on an iOS6 iPhone, I encounter a strange behavior almost everytime. The "Take Photo...Choose Existing" dialog reapears on my first tap after the original choosing.

Code:
<html>
<head>
	<title>image upload test</title>
	<!--iOS 6 and Sench-Touch-1.1 cause a toast window to reappear after choosing a file and tapping anywhere -->
	<script type="text/javascript" src="/_m/assets/libraries/Sencha-Touch-1.1/sencha-touch-debug.js"></script>
	<meta name="viewport" content="maximum-scale=0.6667; width=480" />
</head>
<body>
	<form action="ImgUploadTestPost.aspx" method="post" enctype="multipart/form-data" name="imgPost">
		<input type="file" name="upload1" />
	</form>
</body>
</html>
To duplicate, click on the Choose File button, select a photo, tap Use, and then tap the web page gain.

I have not looked too far into this, but wondered if anyone else has run into this.