good questions and thanks a lot getting back ... We are trace via httpWatch and the Flash trace... Depending on which swf file is truncated, get see different behaviors.
For Example we get a #2036 exception in case we load a file when running the application for a while. In case will load our core application file we do not get a Flash exception or anything else in the browser. We just see I the httpWatch trace a received file size less than the expected size of the swf.
We got in touch with Microsoft support and we created traces for the IE via STRACE. Would it be helpful to get this traces?
Here's something new and maybe something familiar ...
The server at the customer in question is using, based on the header information the following encoding:
Any experience with this setting?
I found some other forum entries that indicate a problem in this context (Loading larger swf files via https)