You should also try adding the debug data bindings to the page to see what's going on. See if there is an error or problem alerted. Check the folder and file names to make sure they are what you expect... 
I get the following debug when the page loads. Upon submitting the form I got no additional information.
Status object: WA_UploadResult1
statusCode : -1
errorMessage :
clientFileName :
fileExtension :
serverFileName :
serverSimpleFileName :
serverDirectory :
contentType :
fileWasOverwritten :
fileWasSkipped :
fileWasRenamed :
fileSize : -1
isImage :
imageWidth : -1
imageHeight : -1
WA_UploadResult1_1:
clientFileName :
fileExtension :
serverFileName :
serverSimpleFileName :
serverDirectory :
contentType :
fileSize : -1
imageWidth : -1
imageHeight : -1


