reverted:
--- b/.htaccess
+++ a/.htaccess
@@ -104,7 +104,7 @@
   #
   # If your site is running in a VirtualDocumentRoot at http://example.com/,
   # uncomment the following line:
+  # RewriteBase /
-  RewriteBase /
 
   # Redirect common PHP files to their new locations.
   RewriteCond %{REQUEST_URI} ^(.*)?/(update.php) [OR]