RSRP-288503: Visual Studio 2010 (using ReSharper 6.0 or 6.1) crashes when opening cs files or looking for usages

Regularily, VS2010 crashes when opening cs files or using the "find usages" command. In fact, on certain files, the crash happens everytime. We have no other option that to relaunch Visual Studio.
Other developpers have the same issue on the same files.
When ReSharper is "suspended", VS2010 doesn't crash on those files.
The project is a Silverlight 5 project. I'm not sure about it, but I think it didn't crash before we switched from SL4 to SL5.

I tried to switch back to ReSharper 6.0, tried ReSharper 6.1.1, they all crash on the same files.

The event log is pretty short:

• <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  
• <System>

<Provider Name="Application Error" />
<EventID Qualifiers="0">1000</EventID>
<Level>2</Level>
<Task>100</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2012-02-23T14:17:10.000000000Z" />
<EventRecordID>44127</EventRecordID>
<Channel>Application</Channel>
<Computer>xxxxxxxxxxxxxxxxxxxx</Computer>
<Security />
</System>

• <EventData>

<Data>devenv.exe</Data>
<Data>10.0.40219.1</Data>
<Data>4d5f2a73</Data>
<Data>clr.dll</Data>
<Data>4.0.30319.261</Data>
<Data>4ec9f6ff</Data>
<Data>c00000fd</Data>
<Data>000018f6</Data>
<Data>1dc8</Data>
<Data>01ccf23589e96beb</Data>
<Data>C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\devenv.exe</Data>
<Data>C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll</Data>
<Data>127c0b45-5e29-11e1-a115-f04da269a71c</Data>
</EventData>
</Event>

System is Windows 7 Professionnal SP1 64 bits (4GB memory)

This is very annoying since ReSharper have to be disabled most of the time.