diff --git a/VERSION b/VERSION
index 55d0853b..50b1cc8f 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-Version 1.99.4 (2012-02-28 22:00:22) stable
+Version 1.99.4 (2012-02-29 11:11:18) stable
diff --git a/applications/admin/controllers/debug.py b/applications/admin/controllers/debug.py
index ce30f15e..23c13519 100644
--- a/applications/admin/controllers/debug.py
+++ b/applications/admin/controllers/debug.py
@@ -58,6 +58,7 @@ def interact():
         lines = {}
 
     if filename:
+        web_debugger.set_burst(2)
         env = web_debugger.do_environment()
         f_locals = env['locals']
         f_globals = {}
diff --git a/gluon/debug.py b/gluon/debug.py
index 0fa7a33d..8209185b 100644
--- a/gluon/debug.py
+++ b/gluon/debug.py
@@ -86,39 +86,28 @@ def communicate(command=None):
 # New debugger implementation using qdb and a web UI
 
 import gluon.contrib.qdb as qdb
-from gluon import portalocker
-
-
-def lock(name=''):
-    from gluon.globals import current
-    locker = open(os.path.join(current.request.folder, 'debug_%s.lock' % name), 
-                  'a')
-    portalocker.lock(locker, portalocker.LOCK_EX)
-    return locker
-
-
-def unlock(locker):
-    portalocker.unlock(locker)
-    locker.close()
+from threading import RLock
 
+interact_lock = RLock()
+run_lock = RLock()
 
 def check_interaction(fn):
     "Decorator to clean and prevent interaction when not available"
     def check_fn(self, *args, **kwargs):
-        locker = lock('interact')
+        interact_lock.acquire()
         try:
             if self.filename:
                 self.clear_interaction()
                 fn(self, *args, **kwargs)
         finally:
-            unlock(locker)
+            interact_lock.release()
     return check_fn
 
       
 class WebDebugger(qdb.Frontend):
     "Qdb web2py interface"
     
-    def __init__(self, pipe, completekey='tab', stdin=None, stdout=None, skip=None):
+    def __init__(self, pipe, completekey='tab', stdin=None, stdout=None):
         qdb.Frontend.__init__(self, pipe)
         self.clear_interaction()
 
@@ -130,21 +119,21 @@ class WebDebugger(qdb.Frontend):
     # redefine Frontend methods:
     
     def run(self):
-        locker = lock('run')
+        run_lock.acquire()
         try:
             while self.pipe.poll():
                 qdb.Frontend.run(self)
         finally:
-            unlock(locker)
+            run_lock.release()
 
     def interaction(self, filename, lineno, line):
         # store current status
-        locker = lock('interact')
+        interact_lock.acquire()
         try:
             self.filename = filename
             self.lineno = lineno
         finally:
-            unlock(locker)
+            interact_lock.release()
 
     def exception(self, title, extype, exvalue, trace, request):
         self.exception_info = {'title': title, 
@@ -180,7 +169,7 @@ front_conn = qdb.QueuePipe("parent", parent_queue, child_queue)
 child_conn = qdb.QueuePipe("child", child_queue, parent_queue)
 
 web_debugger = WebDebugger(front_conn)                          # frontend
-qdb_debugger = qdb.Qdb(pipe=child_conn, redirect_stdio=False)   # backend
+qdb_debugger = qdb.Qdb(pipe=child_conn, redirect_stdio=False, skip=None)   # backend
 dbg = qdb_debugger
 
 import gluon.main