With eZ Publish Community Project 2013.09 and eZ MultiUpload 5.2 in legacy mode (admin), when choosing files with the browse button, the files are sent (it says OK) but no object is created.
It seems that the POST fields posted by the flash uploader are missing : eZ says that there is no HTTP file in the request... But when I look into the Chrome Dev Toolbar, Network section, POST fields seems to be OK...

Strange isn't it ?

This problem occurs with Chrome (last version), FF (last version) and IE10.
Tested with images and odt documents.