Yep I had the same issue. I made a small analysis of the problem in this post:
http://wordpress.org/support/topic/freezes-when-uploading-many-large-2mb-pictures
I really wish this developer would update this plugin or perhaps someone could take it over. Its really useful and such time saver with big batches! If it worked properly!
might be a good idea to allow users to turn off the thumbnail creation process in order to make this plugin usable for people displaying large jpg files. Its very sexy, but doenst seem to work with big files my end. perhaps its a limit set by my provider!?
im having the same issue on my local WAMPserver!
WampServer 2.2
Apache Version : 2.2.22
PHP Version : 5.4.3
MySQL Version : 5.5.24
