Gotta escape & before other stuff in markdownify - in 1.8 it was always first but not in 1.9 because the list of entities was a hash. This change converts to an array.

lib/diaspora/markdownify.rb

@@ -116,13 +116,13 @@ module Diaspora
       end
 
       def preprocess(full_document)
-        entities = {
+        entities = [
-          '>' => '>',
+          ['&', '&'],
-          '<' => '&lt;',
+          ['>', '&gt;'],
-          '&' => '&amp;',
+          ['<', '&lt;']
-        }
+        ]
-        entities.each do |k,v|
+        entities.each do |original, replacement|
-          full_document = full_document.gsub(k, v)
+          full_document = full_document.gsub(original, replacement)
         end
 
         if @specialchars