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Can you try running the following script? (save to check.py, run "python check.py")

import time
import xmlrpclib
import socket
import traceback
import roslib.scriptutil
from ros import rosnode

def check(n):
    master = roslib.scriptutil.get_master()
    try:
        socket.setdefaulttimeout(3.0)
        node_api = rosnode.get_api_uri(master, n)
        if not node_api:
            print "Master does not have lookup information for node [%s]"%n
            return

        node = xmlrpclib.ServerProxy(node_api)
        start = time.time()
        socket.setdefaulttimeout(3.0)
        code, msg, bus_info = node.getBusInfo('/roswtf')
        end = time.time()
        if (end-start) > 1.:
            print "Communication with node [%s] is very slow"%n
        if code != 1:
            print "Node [%s] would not return bus info"%n
        print "[%s] ok"%(n)
    except socket.error, e:
        pass #ignore as we have rules to catch this
    except Exception, e:
        traceback.print_exc()

check('/rosout')
check('/blub')

Can you try running the following script? (save to check.py, run "python check.py")

import time
import xmlrpclib
import socket
import traceback
import roslib.scriptutil
from ros import rosnode

def check(n):
    master = roslib.scriptutil.get_master()
    try:
        socket.setdefaulttimeout(3.0)
        node_api = rosnode.get_api_uri(master, n)
        if not node_api:
            print "Master does not have lookup information for node [%s]"%n
            return

        node = xmlrpclib.ServerProxy(node_api)
        start = time.time()
        socket.setdefaulttimeout(3.0)
        code, msg, bus_info = node.getBusInfo('/roswtf')
        end = time.time()
        if (end-start) > 1.:
            print "Communication with node [%s] is very slow"%n
        if code != 1:
            print "Node [%s] would not return bus info"%n
        print "[%s] ok"%(n)
    except socket.error, e:
        pass #ignore as we have rules to catch this
    except Exception, e:
        traceback.print_exc()

check('/rosout')
check('/blub')

Index: graph.py
===================================================================
--- graph.py    (revision 14535)
+++ graph.py    (working copy)
@@ -304,6 +304,8 @@
         except socket.error, e:
             pass #ignore as we have rules to catch this
         except Exception, e:
+            import traceback
+            traceback.print_exc()
             ctx.errors.append(WtfError("Communication with [%s] raised an error: %s"%(n, str(e))))
         finally:
             self.done = True