I have the same (or similar) problem. The image upload process ends correctly, but once aparenly uploaded, theres only a blank image with the name of the picture displayed (even in the mediabrowser). When i connect via ftp to the upolads folder, in fact, there is no image uploaded.
Strange, and i don’t no why, but sometimes the upload works fine… for a while (or sometimes only for one image). And no, i dont get any error message. Just blank images.
I tried to make a new “Clean” installation of WordPress, without any plugin activated, but still the same issue.
Someone has any idea what could happen? Solution?