diff --git a/NEWS.md b/NEWS.md
index dce0365d..de39e8d2 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -5,6 +5,9 @@
 1.4.0
 -----
 * Add arraybuffer format
+* Fix filesystem access conflict among clustered processes
+* Fix discard of queued export requests on error
+* Really fix problem identifying OAuth requests
 
 1.3.10
 ------
diff --git a/app.js b/app.js
index 96c37f49..9b9db8ab 100755
--- a/app.js
+++ b/app.js
@@ -13,9 +13,9 @@ var _ = require('underscore');
 
 // sanity check arguments
 var ENV = process.argv[2];
-if (ENV != 'development' && ENV != 'production' && ENV != 'test') {
+if (ENV != 'development' && ENV != 'production' && ENV != 'test' && ENV != 'staging' ) {
   console.error("\n./app [environment]");
-  console.error("environments: [development, test, production]");
+  console.error("environments: [development, staging, production, test]");
   process.exit(1);
 }
 
diff --git a/app/models/formats/ogr.js b/app/models/formats/ogr.js
index ac58e723..7d7e0d78 100644
--- a/app/models/formats/ogr.js
+++ b/app/models/formats/ogr.js
@@ -160,7 +160,7 @@ console.log(['ogr2ogr',
 ogr.prototype.toOGR_SingleFile = function(dbname, user_id, gcol, sql, skipfields, fmt, ext, callback) {
   var tmpdir = global.settings.tmpDir || '/tmp';
   var reqKey = [ fmt, dbname, user_id, gcol, this.generateMD5(sql) ].concat(skipfields).join(':');
-  var outdirpath = tmpdir + '/sqlapi-' + reqKey;
+  var outdirpath = tmpdir + '/sqlapi-' + process.pid + '-' + reqKey;
   var dumpfile = outdirpath + ':cartodb-query.' + ext;
 
   // TODO: following tests:
@@ -178,12 +178,8 @@ ogr.prototype.sendResponse = function(opts, callback) {
   } else {
     baking = bakingExports[reqKey] = { req: [ qElem ] };
     this.generate(opts, function(err, dumpfile) {
-      if(err) {
-        next(err);
-        return;
-      }
       Step (
-        function sendResults(err) {
+        function sendResults() {
           var nextPipe = function(finish) {
             var r = baking.req.shift();
             if ( ! r ) { finish(null); return; }
diff --git a/app/models/formats/shp.js b/app/models/formats/shp.js
index 7e48d82a..8e81621d 100644
--- a/app/models/formats/shp.js
+++ b/app/models/formats/shp.js
@@ -25,7 +25,7 @@ p.toSHP = function (dbname, user_id, gcol, sql, skipfields, filename, callback)
   var zip = 'zip'; // FIXME: make configurable
   var tmpdir = global.settings.tmpDir || '/tmp';
   var reqKey = [ 'shp', dbname, user_id, gcol, this.generateMD5(sql) ].concat(skipfields).join(':');
-  var outdirpath = tmpdir + '/sqlapi-' + reqKey; 
+  var outdirpath = tmpdir + '/sqlapi-' + process.pid + '-' + reqKey; 
   var zipfile = outdirpath + '.zip';
   var shapefile = outdirpath + '/' + filename + '.shp';
 
@@ -87,11 +87,14 @@ p.toSHP = function (dbname, user_id, gcol, sql, skipfields, filename, callback)
           unlinkall(outdirpath, files, function(err) {
             fs.rmdir(outdirpath, function(err) {
               if ( err ) console.log("Removing dir " + path + ": " + err);
-              callback(topError, zipfile);
+              next(topError, zipfile);
             });
           });
         }
       });
+    },
+    function finalStep(err, zipfile) {
+      callback(err, zipfile);
     }
   );
 };
diff --git a/app/models/oauth.js b/app/models/oauth.js
index 35a30502..5ed2621a 100644
--- a/app/models/oauth.js
+++ b/app/models/oauth.js
@@ -108,7 +108,7 @@ var oAuth = function(){
           return;
         }
         
-        var path   = httpProto + '://' + host + req.route.path;
+        var path   = httpProto + '://' + host + req.path;
         that.splitParams(req.query);
 
         // remove signature from passed_tokens