diff --git a/src/alpm_config.vala b/src/alpm_config.vala
index 96e11db..368fa6e 100644
--- a/src/alpm_config.vala
+++ b/src/alpm_config.vala
@@ -138,11 +138,12 @@ class AlpmConfig {
 		Alpm.Errno error = 0;
 		Alpm.Handle? handle = null;
 		if (tmp_db) {
-			string tmp_dbpath = "/tmp/pamac-checkdbs-%s".printf (Environment.get_user_name ());
+			string tmp_dbpath = "/tmp/pamac-checkdbs";
 			try {
 				Process.spawn_command_line_sync ("mkdir -p %s".printf (tmp_dbpath));
 				Process.spawn_command_line_sync ("ln -sf %s/local %s".printf (dbpath, tmp_dbpath));
 				Process.spawn_command_line_sync ("cp -au %s/sync %s".printf (dbpath, tmp_dbpath));
+				Process.spawn_command_line_sync ("chmod -R 777 %s/sync".printf (tmp_dbpath));
 				handle = new Alpm.Handle (rootdir, tmp_dbpath, out error);
 			} catch (SpawnError e) {
 				stderr.printf ("SpawnError: %s\n", e.message);
diff --git a/src/manager_window.vala b/src/manager_window.vala
index c4f9db7..a126b3e 100644
--- a/src/manager_window.vala
+++ b/src/manager_window.vala
@@ -17,7 +17,7 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-const string VERSION = "5.0.0";
+const string VERSION = "5.1.0";
 
 namespace Pamac {
 
diff --git a/src/system_daemon.vala b/src/system_daemon.vala
index 7d199f9..5beb2f0 100644
--- a/src/system_daemon.vala
+++ b/src/system_daemon.vala
@@ -141,8 +141,8 @@ namespace Pamac {
 					(alpm_action) => {
 						alpm_action.run ();
 					},
-					// two threads at a time
-					2,
+					// only one thread created so alpm action will run one after one
+					1,
 					// no exclusive thread
 					false
 				);
@@ -168,7 +168,12 @@ namespace Pamac {
 				alpm_handle.logcb = (Alpm.LogCallBack) cb_log;
 				lockfile = GLib.File.new_for_path (alpm_handle.lockfile);
 				files_handle = alpm_config.get_handle (true);
+				files_handle.eventcb = (Alpm.EventCallBack) cb_event;
+				files_handle.progresscb = (Alpm.ProgressCallBack) cb_progress;
+				files_handle.questioncb = (Alpm.QuestionCallBack) cb_question;
 				files_handle.fetchcb = (Alpm.FetchCallBack) cb_fetch;
+				files_handle.totaldlcb = (Alpm.TotalDownloadCallBack) cb_totaldownload;
+				files_handle.logcb = (Alpm.LogCallBack) cb_log;
 			}
 		}
 
@@ -471,21 +476,30 @@ namespace Pamac {
 			write_log_file ("synchronizing package lists");
 			cancellable.reset ();
 			int force = (force_refresh) ? 1 : 0;
+			// try to copy refresh dbs in tmp
+			string tmp_dbpath = "/tmp/pamac-checkdbs";
+			try {
+				Process.spawn_command_line_sync ("cp -au %s/sync %s".printf (tmp_dbpath, alpm_handle.dbpath));
+			} catch (SpawnError e) {
+				stderr.printf ("SpawnError: %s\n", e.message);
+			}
 			// update ".db"
 			bool success = update_dbs (alpm_handle, force);
 			if (cancellable.is_cancelled ()) {
 				refresh_finished (false);
 				return;
 			}
-			if (success) {
+			// update ".files", do not need to know if we succeeded
+			update_dbs (files_handle, force);
+			if (cancellable.is_cancelled ()) {
+				refresh_finished (false);
+			} else if (success) {
 				refreshed = true;
 				refresh_finished (true);
 			} else {
 				current_error.message = _("Failed to synchronize any databases");
 				refresh_finished (false);
 			}
-			// update ".files", do it in background, do not need to know if we succeeded
-			update_dbs (files_handle, force);
 		}
 
 		public void start_refresh (bool force, GLib.BusName sender) {
diff --git a/src/transaction.vala b/src/transaction.vala
index ac8431a..fd3099c 100644
--- a/src/transaction.vala
+++ b/src/transaction.vala
@@ -472,6 +472,9 @@ namespace Pamac {
 						success = false;
 						finish_transaction ();
 					}
+				} else {
+					success = false;
+					finish_transaction ();
 				}
 			});
 		}
@@ -1396,8 +1399,8 @@ namespace Pamac {
 					rates_nb = 0;
 					fraction = 0;
 					timer.start ();
-					if (filename.has_suffix (".db")) {
-						string action = dgettext (null, "Refreshing %s").printf (filename.replace (".db", "")) + "...";
+					if (filename.has_suffix (".db") || filename.has_suffix (".files")) {
+						string action = dgettext (null, "Refreshing %s").printf (filename) + "...";
 						reset_progress_box (action);
 					}
 				} else if (xfered == total) {
diff --git a/src/tray.vala b/src/tray.vala
index e8c6cb0..eff0531 100644
--- a/src/tray.vala
+++ b/src/tray.vala
@@ -220,7 +220,9 @@ namespace Pamac {
 				}
 			} else {
 				if (lockfile.query_exists ()) {
-					extern_lock = true;
+					if (!check_pamac_running ()) {
+						extern_lock = true;
+					}
 				}
 			}
 			return true;
diff --git a/src/user_daemon.vala b/src/user_daemon.vala
index 557e1b9..09d8dc9 100644
--- a/src/user_daemon.vala
+++ b/src/user_daemon.vala
@@ -847,6 +847,14 @@ namespace Pamac {
 				db.update (0);
 				syncdbs.next ();
 			}
+			// refresh file dbs
+			var tmp_files_handle = alpm_config.get_handle (true, true);
+			syncdbs = tmp_files_handle.syncdbs;
+			while (syncdbs != null) {
+				unowned Alpm.DB db = syncdbs.data;
+				db.update (0);
+				syncdbs.next ();
+			}
 			string[] local_pkgs = {};
 			unowned Alpm.List<unowned Alpm.Package> pkgcache = tmp_handle.localdb.pkgcache;
 			while (pkgcache != null) {