The java uploader for map files has been replaced with a more modern method. This replacement was required to due security issues with Java that ended up with them restricting applications from running based on certificate type (issue here (http://forums.gpsfiledepot.com/index.php/topic,3631.0.html)).
The new upload method works best from a modern browser (new version of Chrome or Firefox as well as more recent versions of internet explorer) but will fall back to using flash as required.
There are a few "oddities" that may be experienced when selecting files but they have been addressed in the help box to the right of the upload area.
If you encounter any issues please post them here.