Using 0.5 version of the plugin on WP 3.8.1.
My original db is about 3.1MB. The Migrate DB export (which excludes post revisions and spam comments) ends at 330kb. It stops midway through the wp_options table.
The modified sql file is downloaded but the 'results' page that list the number of strings modified does not display, just the page header 'Migrate DB' (along with the WP admin menu).
When I turn on WP_DEBUG it just puts the sql file in the browser and that ends at the same place as the downloaded file. No warnings or errors in the Apache error_log.
In the browser the only warnings are about deprecated parameters for a WP core file.
I have uploaded the original db and downloaded file to Amazon S3 and can email the public links.