Just a little return of experience...
I was experimenting white pages using this mod (while it was working in the past). It was due to a lack of memory caused by the huge number of markers to display on the map.
I could change that by adding
Code:
ini_set("memory_limit", "256M");
just after the tag "<?php" in file dcMembermap.php (at the VB root)
While looking at the code, I can see that it is not optimized for huge number of markers.
I'll try to improve that and share a proposal