diff --git a/configuration/config_object.go b/configuration/config_object.go
index ed14a23..d846412 100644
--- a/configuration/config_object.go
+++ b/configuration/config_object.go
@@ -22,6 +22,18 @@ type Config struct {
     TEMP map[string]string
 }
 
+func (c *Config) initializePathsMac() {
+    fmt.Println("Initializing configuration paths...")
+    home_path := os.Getenv("HOME")
+    data_path := path.Join(home_path, "Library", "Application Support", "URTrator")
+    fmt.Println("Will use data path: " + data_path)
+    c.TEMP["DATA"] = data_path
+
+    if _, err := os.Stat(data_path); os.IsNotExist(err) {
+        os.MkdirAll(data_path, 0755)
+    }
+}
+
 func (c *Config) initializePathsNix() {
     fmt.Println("Initializing configuration paths...")
 
@@ -47,6 +59,8 @@ func (c *Config) Initialize() {
 
     if runtime.GOOS == "linux" {
         c.initializePathsNix()
+    } else if runtime.GOOS == "darwin" {
+        c.initializePathsMac()
     } else {
         panic("We're not ready for other OSes yet!")
     }
diff --git a/database/migrations.go b/database/migrations.go
index 5efb30b..bb0e0de 100644
--- a/database/migrations.go
+++ b/database/migrations.go
@@ -51,6 +51,10 @@ func migrate_full(db *Database, version int) {
         two_to_three(db)
         version = 3
     }
+    if version == 3 {
+        three_to_four(db)
+        version = 4
+    }
 }
 
 // Initial database structure.
@@ -75,3 +79,9 @@ func two_to_three(db *Database) {
     db.Db.MustExec("CREATE TABLE urt_profiles (name VARCHAR(128) NOT NULL, version VARCHAR(5) NOT NULL DEFAULT '4.3', binary VARCHAR(1024) NOT NULL, second_x_session VARCHAR(1) NOT NULL DEFAULT '0', additional_parameters VARCHAR(1024) NOT NULL DEFAULT '')")
     db.Db.MustExec("UPDATE database SET version=3")
 }
+
+// UrT version inconsistency.
+func three_to_four(db *Database) {
+    fmt.Println("Upgrading database from 3 to 4...")
+    db.Db.MustExec("UPDATE urt_profiles SET version='4.3.0' WHERE version='4.3.000'")
+}
diff --git a/ui/options_profile.go b/ui/options_profile.go
index 3d7267a..d8f95c1 100644
--- a/ui/options_profile.go
+++ b/ui/options_profile.go
@@ -131,7 +131,7 @@ func (op *OptionsProfile) Initialize(update bool, lp func()) {
     urt_version_sep := gtk.NewHSeparator()
     op.urt_version_combo = gtk.NewComboBoxText()
     op.urt_version_combo.AppendText("4.2.023")
-    op.urt_version_combo.AppendText("4.3.000")
+    op.urt_version_combo.AppendText("4.3.0")
     op.urt_version_combo.SetActive(1)
     urt_version_hbox.PackStart(urt_version_label, false, true, 5)
     urt_version_hbox.PackStart(urt_version_sep, true, true, 5)
@@ -212,7 +212,7 @@ func (op *OptionsProfile) InitializeUpdate(profile_name string, lp func()) {
         op.another_x_session.SetActive(true)
     }
 
-    if profile[0].Version == "4.3.000" {
+    if profile[0].Version == "4.3.0" {
         op.urt_version_combo.SetActive(1)
     } else {
         op.urt_version_combo.SetActive(0)