Hi Pam,
If debug is ON that could be the reason why ( it happen to me ).
Try to turn debug off to see if that solve your problem.
change $gallery->app->debug = "yes"; to $gallery->app->debug = "no";
in config.php.
if it's already set to "no" then sorry no more clues.
ps: you don't have to select all the files in remote to upload. just drag and drop and hit upload
phil