.NET Runtime Event ID 1021 after patch Tuesday updates

i've searched google/technet following , have come empty.  performed updates came out week (01/10/2013) , i'm receiving following error on 2008r2 sp1 servers:

log name:      application
source:        .net runtime
date:          1/10/2013 4:23:06 am
event id:      1021
task category: none
level:         warning
keywords:      classic
user:          n/a
computer:      servername.domain.local
description:
.net runtime version 2.0.50727.5466 - executable "c:\windows\microsoft.net\framework64\v4.0.30319\mscorsvw.exe" appdomain "defaultdomain" deleted obsolete native image "c:\windows\assembly\nativeimages_v2.0.50727_64\mscorlib\74a5f0c2bc0d0e6e3c4ec4886b9be891\mscorlib.ni.dll"
event xml:
<event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <system>
    <provider name=".net runtime" />
    <eventid qualifiers="0">1021</eventid>
    <level>3</level>
    <task>0</task>
    <keywords>0x80000000000000</keywords>
    <timecreated systemtime="2013-01-10t12:23:06.000000000z" />
    <eventrecordid>421817</eventrecordid>
    <channel>application</channel>
    <computer>servername.domain.local</computer>
    <security />
  </system>
  <eventdata>
    <data>.net runtime version 2.0.50727.5466 - executable "c:\windows\microsoft.net\framework64\v4.0.30319\mscorsvw.exe" appdomain "defaultdomain" deleted obsolete native image "c:\windows\assembly\nativeimages_v2.0.50727_64\mscorlib\74a5f0c2bc0d0e6e3c4ec4886b9be891\mscorlib.ni.dll"</data>
  </eventdata>
</event>

any thoughts whether or not ignorable warning or there needs fixed?

thanks!

after further review, appears error happened twice in row on each machine, win7 machines, after updates installed.  i've not seen them since.

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