diff -Naur src_old/modules/__init__.py src/modules/__init__.py
--- src_old/modules/__init__.py	2007-08-29 08:33:43.000000000 +0200
+++ src/modules/__init__.py	2007-08-29 08:34:36.000000000 +0200
@@ -209,9 +209,10 @@
         mEnabledModules.append(name)
         prefs.set(__name__, 'enabled_modules', mEnabledModules)
     except:
-        return traceback.format_exc()
-    finally:
         mModulesLock.release()
+        return traceback.format_exc()
+
+    mModulesLock.release()

     instance.start()