diff --git a/dom0/init.d/qubes_core b/dom0/init.d/qubes_core
index 072f0ac2..d4d5b626 100755
--- a/dom0/init.d/qubes_core
+++ b/dom0/init.d/qubes_core
@@ -53,8 +53,12 @@ start()
     MEMINFO_DELAY_USEC=100000
     /usr/lib/qubes/meminfo-writer $MEM_CHANGE_THRESHOLD_KB $MEMINFO_DELAY_USEC &
 
-    # Reply block events to hide mounted devices from qubes-block list (at first udev run, only / is mounted)
-    udevadm trigger --subsystem-match=block --action=add
+    # Hide mounted devices from qubes-block list (at first udev run, only / is mounted)
+    for dev in `xenstore-list /local/domain/0/qubes-block-devices`; do
+    ( eval `udevadm info -q property -n $dev|sed -e 's/\([^=]*\)=\(.*\)/export \1="\2"/'`; 
+      /usr/lib/qubes/block_add_change
+    )
+    done
 
     touch /var/lock/subsys/qubes_core
     success
diff --git a/dom0/qvm-core/qubes.py b/dom0/qvm-core/qubes.py
index c3f71e41..937bbad0 100755
--- a/dom0/qvm-core/qubes.py
+++ b/dom0/qvm-core/qubes.py
@@ -245,12 +245,13 @@ class QubesVm(object):
             "kernel": { "default": None, 'order': 30 },
             "uses_default_kernel": { "default": True, 'order': 30 },
             "uses_default_kernelopts": { "default": True, 'order': 30 },
-            "kernelopts": { "default": "", 'order': 30, "eval": \
+            "kernelopts": { "default": "", 'order': 31, "eval": \
                 'value if not self.uses_default_kernelopts else default_kernelopts_pcidevs if len(self.pcidevs) > 0 else default_kernelopts' },
             "mac": { "attr": "_mac", "default": None },
             "include_in_backups": { "default": True },
             "services": { "default": {}, "eval": "eval(str(value))" },
             "debug": { "default": False },
+            "default_user": { "default": "user" },
             ##### Internal attributes - will be overriden in __init__ regardless of args
             "appmenus_templates_dir": { "eval": \
                 'self.dir_path + "/" + default_appmenus_templates_subdir if self.updateable else ' + \
@@ -267,7 +268,8 @@ class QubesVm(object):
         for prop in ['qid', 'name', 'dir_path', 'memory', 'maxmem', 'pcidevs', 'vcpus', 'internal',\
             'uses_default_kernel', 'kernel', 'uses_default_kernelopts',\
             'kernelopts', 'services', 'installed_by_rpm',\
-            'uses_default_netvm', 'include_in_backups', 'debug' ]:
+            'uses_default_netvm', 'include_in_backups', 'debug',\
+            'default_user' ]:
             attrs[prop]['save'] = 'str(self.%s)' % prop
         # Simple paths
         for prop in ['conf_file', 'root_img', 'volatile_img', 'private_img']:
@@ -642,12 +644,18 @@ class QubesVm(object):
 
         return "NA"
 
-    def is_fully_usable(self):
+    def is_guid_running(self):
         xid = self.get_xid()
         if xid < 0:
             return False
         if not os.path.exists('/var/run/qubes/guid_running.%d' % xid):
             return False
+        return True
+
+    def is_fully_usable(self):
+        # Running gui-daemon implies also VM running
+        if not self.is_guid_running():
+            return False
         # currently qrexec daemon doesn't cleanup socket in /var/run/qubes, so
         # it can be left from some other VM
         return True
@@ -1298,7 +1306,7 @@ class QubesVm(object):
                 raise QubesException("Not enough memory to start '{0}' VM! Close one or more running VMs and try again.".format(self.name))
 
         xid = self.get_xid()
-        if os.getenv("DISPLAY") is not None and not os.path.isfile("/var/run/qubes/guid_running.{0}".format(xid)):
+        if os.getenv("DISPLAY") is not None and not self.is_guid_running():
             self.start_guid(verbose = verbose, notify_function = notify_function)
 
         args = [qrexec_client_path, "-d", str(xid), command]
@@ -2534,7 +2542,7 @@ class QubesVmCollection(dict):
                 "installed_by_rpm", "internal",
                 "uses_default_netvm", "label", "memory", "vcpus", "pcidevs",
                 "maxmem", "kernel", "uses_default_kernel", "kernelopts", "uses_default_kernelopts",
-                "mac", "services", "include_in_backups", "debug" )
+                "mac", "services", "include_in_backups", "debug", "default_user" )
 
         for attribute in common_attr_list:
             kwargs[attribute] = element.get(attribute)
diff --git a/dom0/qvm-tools/qvm-prefs b/dom0/qvm-tools/qvm-prefs
index 66664497..98db27ac 100755
--- a/dom0/qvm-tools/qvm-prefs
+++ b/dom0/qvm-tools/qvm-prefs
@@ -76,6 +76,9 @@ def do_list(vm):
     if hasattr(vm, 'debug'):
         print fmt.format("debug", "on" if vm.debug else "off")
 
+    if hasattr(vm, 'default_user'):
+        print fmt.format("default user", str(vm.default_user))
+
 def set_label(vms, vm, args):
     if len (args) != 1:
         print >> sys.stderr, "Missing label name argument!"
@@ -283,7 +286,14 @@ def set_debug(vms, vm, args):
         vm.debug = False
     else:
         vm.debug = bool(eval(args[0].capitalize()))
+    return True
 
+def set_default_user(vms, vm, args):
+    if len (args) != 1:
+        print >> sys.stderr, "Missing user name!"
+        return False
+
+    vm.default_user = args[0]
     return True
 
 def set_include_in_backups(vms, vm, args):
@@ -308,6 +318,7 @@ properties = {
     "name": set_name,
     "mac": set_mac,
     "debug": set_debug,
+    "default_user": set_default_user,
 }
 
 
diff --git a/dom0/qvm-tools/qvm-run b/dom0/qvm-tools/qvm-run
index 84f7e099..89d53756 100755
--- a/dom0/qvm-tools/qvm-run
+++ b/dom0/qvm-tools/qvm-run
@@ -98,7 +98,7 @@ def main():
     parser.add_option ("-q", "--quiet", action="store_false", dest="verbose", default=True)
     parser.add_option ("-a", "--auto", action="store_true", dest="auto", default=False,
                        help="Auto start the VM if not running")
-    parser.add_option ("-u", "--user", action="store", dest="user", default="user",
+    parser.add_option ("-u", "--user", action="store", dest="user", default=None,
                        help="Run command in a VM as a specified user")
     parser.add_option ("--tray", action="store_true", dest="tray", default=False,
                        help="Use tray notifications instead of stdout" )
@@ -188,12 +188,12 @@ def main():
             exit(1)
         vms_list.append(vm)
 
-    if takes_cmd_argument:
-        cmd = "{user}:{cmd}".format(user=options.user, cmd=cmdstr)
-    else:
-        cmd = None
-
     for vm in vms_list:
+        if takes_cmd_argument:
+            cmd = "{user}:{cmd}".format(user=options.user if options.user else vm.default_user, cmd=cmdstr)
+        else:
+            cmd = None
+
         vm_run_cmd(vm, cmd, options)
 
 
diff --git a/misc/qubes_download_dom0_updates.sh b/misc/qubes_download_dom0_updates.sh
index 33bc46d3..de869c55 100755
--- a/misc/qubes_download_dom0_updates.sh
+++ b/misc/qubes_download_dom0_updates.sh
@@ -43,6 +43,10 @@ fi
 mkdir -p $DOM0_UPDATES_DIR/etc
 sed -i '/^reposdir\s*=/d' $DOM0_UPDATES_DIR/etc/yum.conf
 
+# Rebuild rpm database in case of different rpm version
+rm -f $DOM0_UPDATES_DIR/var/lib/rpm/__*
+rpm --root=$DOM0_UPDATES_DIR --rebuilddb
+
 if [ "$CLEAN" = "1" ]; then
     yum $OPTS clean all
     rm -f $DOM0_UPDATES_DIR/packages/*