Rijndael.CreateDecryptor() crashes the IIS worker thread (but only in IIS 7.5 64bit)
<p>We have an app that works great on IIS 6 and IIS 7. As soon as we go to Windows 2008 R2 with IIS7.5 we get an IIS crash. The worker thread actually dies and leaves a message in the event viewer:</p>

<pre><code>Fault bucket , type 0
Event Name: APPCRASH
...
Problem signature: 
P1: w3wp.exe
P2: 7.5.7600.16385
P3: 4a5bcd2b
P4: mscorwks.dll
...
</code></pre>

<p>I have traced it down to a single line of code that can produce the crash:</p>

<pre><code>var b = Rijndael.CreateDecryptor();
</code></pre>

<p>Is there some specific way to use this in a 64-bit environment? </p>
