I installed the 4.6.3 beta and have the same issues:
files can be uploaded but expose never shows the progress or completion. photos are only avialable after I click cancel and batch upload only does the first image.
The system check only gave the following warning:
WebServer to PHP interface cgi-fcgi Warning Warning
⇒ Recommended apache2handler interface.
Warning /home/pixelspo/public_html/tiyb/components/com_expose/expose/xml/albums.xml File is corrupted or has been altered
the url is
thisisyourband.com/index.php?option=com_expose&Itemid=79
version is 1.0.15 stable