diff --git a/IPython/Extensions/InterpreterExec.py b/IPython/Extensions/InterpreterExec.py
index 0db6571..943023f 100644
--- a/IPython/Extensions/InterpreterExec.py
+++ b/IPython/Extensions/InterpreterExec.py
@@ -5,7 +5,7 @@ We define a special input line filter to allow typing lines which begin with
 '~', '/' or '.'. If one of those strings is encountered, it is automatically
 executed.
 
-$Id: InterpreterExec.py 1039 2006-01-20 23:59:33Z vivainio $"""
+$Id: InterpreterExec.py 1041 2006-01-21 09:29:14Z vivainio $"""
 
 #*****************************************************************************
 #       Copyright (C) 2004 W.J. van der Laan <gnufnork@hetdigitalegat.nl>
@@ -244,18 +244,18 @@ __IPYTHON__.default_option('cd','-q')
 
 # This is redundant, ipy_user_conf.py will determine this
 # Load all of $PATH as aliases
-#if os.name == 'posix':
+if os.name == 'posix':
 #    # %rehash is very fast, but it doesn't check for executability, it simply
 #    # dumps everything in $PATH as an alias. Use rehashx if you want more
 #    # checks.
-#    __IPYTHON__.magic_rehash()
-#else:
+    __IPYTHON__.magic_rehash()
+else:
 #    # Windows users: the list of extensions considered executable is read from
 #    # the environment variable 'pathext'.  If this is undefined, IPython
 #    # defaults to EXE, COM and BAT.
 #    # %rehashx is the one which does extension analysis, at the cost of
 #    # being much slower than %rehash.
-#    __IPYTHON__.magic_rehashx()
+    __IPYTHON__.magic_rehashx()
 
 # Remove %sc,%sx if present as aliases
 __IPYTHON__.magic_unalias('sc')
diff --git a/IPython/UserConfig/ipy_user_conf.py b/IPython/UserConfig/ipy_user_conf.py
index 92b5fd6..2b319eb 100644
--- a/IPython/UserConfig/ipy_user_conf.py
+++ b/IPython/UserConfig/ipy_user_conf.py
@@ -40,10 +40,11 @@ ip.magic('alias d ls -F --color=auto')
 
 # Make available all system commands through "rehashing" immediately. 
 # You can comment these lines out to speed up startup on very slow 
-# machines, and to conserve a bit of memory.
-
-if os.name=='posix':
-    ip.magic('rehash')
-else:
-    #slightly slower, but better results esp. with Windows
-    ip.magic('rehashx')
+# machines, and to conserve a bit of memory. Note that pysh profile does this
+# automatically
+
+#if os.name=='posix':
+#    ip.magic('rehash')
+#else:
+#    #slightly slower, but better results esp. with Windows
+#    ip.magic('rehashx')
diff --git a/IPython/ipmaker.py b/IPython/ipmaker.py
index cfc63d7..ce281f7 100644
--- a/IPython/ipmaker.py
+++ b/IPython/ipmaker.py
@@ -6,7 +6,7 @@ Requires Python 2.1 or better.
 
 This file contains the main make_IPython() starter function.
 
-$Id: ipmaker.py 1037 2006-01-20 23:27:53Z vivainio $"""
+$Id: ipmaker.py 1041 2006-01-21 09:29:14Z vivainio $"""
 
 #*****************************************************************************
 #       Copyright (C) 2001-2006 Fernando Perez. <fperez@colorado.edu>
@@ -608,7 +608,8 @@ object? -> Details about 'object'. ?object also works, ?? prints more.
         import ipy_user_conf
 
     except ImportError:
-        IP.InteractiveTB()
+        pass
+        #IP.InteractiveTB() XXX uncomment in a later release
 
     # release stdout and stderr and save config log into a global summary
     msg.config.release_all()