Some basic problems with multicast, IGMP & NLB

Hi out there
We have two DC's with 10G interconnection in  between - these connections are run as L2 links - put into a set of  nexus 5000 (the old nx5020) - acting access-switches - and uplinked to a  set of nexus 7009 which act as L3 switch for us.
We  have a cluster of vmware boxes in each site and are running MS windows  2008 machines with MS NLB for TerminalServices - in IGMP multicast mode -  in VLAN 21.
Now I looked in the log of the nexus 7000 and found that the PIM DR is "flapping" between the two sites from time to time:
2013  Nov 25 22:50:58 ve-coresw-01 %PIM-5-DR_CHANGE:  pim [26128]  DR change  from to on interface Vlan21
2013 Nov  25 22:51:54 ve-coresw-01 %PIM-5-DR_CHANGE:  pim [26128]  DR change from to on interface Vlan21
2013 Nov 25  23:26:07 ve-coresw-01 %PIM-5-DR_CHANGE:  pim [26128]  DR change from to on interface Vlan21
2013 Nov 25  23:26:10 ve-coresw-01 %PIM-5-DR_CHANGE:  pim [26128]  DR change from to on interface Vlan21
I am not that familiar with multicast but the basic concepts are there - in the vrf I have defined
ip pim ssm range
the vlan is defined as:
vlan configuration 21
  layer-2 multicast lookup mac
vlan 2001
under the SVI interface vlan 21 I have also defined - and there is a sample showning the nlb
interface Vlan21
  vrf member DMZ_21
  no ip redirects
  ip address
  ip pim sparse-mode
  ip arp 0100.5E7F.9513
these flapping should only occur if the keep-alives between the two sites are missed 3 times
The uplinks to the nexus 5000 are defined as mrouters
vlan 21
  ip igmp snooping mrouter interface port-channel5
  ip igmp snooping mrouter interface port-channel16
SW5020-01# sh ip igmp snooping vl 21
IGMP Snooping information for vlan 21
  IGMP snooping enabled
  IGMP querier present, address:, version: 2, interface port-channel5  -> the DR on the nx7k
  Switch-querier disabled
  IGMPv3 Explicit tracking enabled
  IGMPv2 Fast leave disabled
  IGMPv1/v2 Report suppression enabled
  IGMPv3 Report suppression disabled
  Link Local Groups suppression enabled
  Router port detection using PIM Hellos, IGMP Queries
  Number of router-ports: 3
  Number of groups: 3
  VLAN vPC function enabled
  Active ports:
    Po10        Po15    Eth1/3  Eth1/11
    Eth1/12     Eth1/13 Eth1/14 Eth1/15
    Eth1/16     Eth1/17 Eth1/18 Eth1/19
    Eth1/20     Eth1/25 Eth1/26 Eth1/27
    Eth1/28     Eth1/29 Eth1/30 Eth1/31
    Eth1/32     Po16    Po5
The  link between the two sites - and boxes - is running error-free. As far  as I can see there hasn't been any problems in that vlan since ??
If I look at f.ex spanning-tree the topology hast changed for long time in that vlan (2 weeks).
Could I harden the igmp multicast setup?
What is happening when a DR is changing? Will the multicast stop work or what happens?
As  far as I understood the DR is the service which forwards the multicast  traffic to the groups so if suddenly some re-negotiation occurs I would  expect that the active traffic will be interrupted.
here the actual MS NLB clusters adresses:
SW5020-01# sh ip igmp snooping groups vl 21
Type: S - Static, D - Dynamic, R - Router port
Vlan  Group Address      Ver  Type  Port list
21  */*                -    R     Po10 Po16 Po5
21     v1   D     Eth1/14 Eth1/19 Eth1/32
21     v1   D     Eth1/12 Eth1/15 Eth1/16
                                    Eth1/26 Eth1/31
21    v2   D     Po15 Eth1/11 Eth1/28
Any suggeestions?

What Is OneClickStarter.exe?
OneClickStarter.exe is a type of EXE file associated with TuneUp Utilities 2013 developed by AVG Technologies for the Windows Operating System. The latest known version of OneClickStarter.exe is 13.0.4000.189, which was produced for Windows.
This EXE file carries a popularity rating of 1 stars and a security rating of "UNKNOWN".
Sounds like you have some misbehaving software on your system.  I would suggest a clean install to see if you still have all the problems you are reporting.

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