I have an install of SilverStripe 2.4.0 and have also installed swfupload, dataobjectmanager, and imagegallery. After trying to create a new Image Gallery page I get the following popup window:
<html>
<head><title>502 Bad Gateway</title></head>
<body bgcolor="white">
<center><h1>502 Bad Gateway</h1></center>
<hr><center>nginx/0.7.65</center>
</body>
</html>
I am running SilverStripe on an nginx server. Please note that this is a duplicate question to another already posted in the General Questions forum (http://www.silverstripe.org/general-questions/show/279081#post279081), but since I am not the owner of the thread I can't move it to this forum where I believe it belongs.