What exactly means "not detected"? Can you see it (Shockwave Flash Object) under Add-ons?
The add-on is detected but when Jscript runs on the web page the detection fails, so for example go to www.Youtube.com.au, the script on the page detects that adobe flash is out of date (or not installed) and prompts the user to install the latest version. No matter how many times this has been tried the detection from Jscript fails. Also this problem is endemic in the displaying of a SWF file, point IE to a SWF file and the same issue occurs with the standard flash install web page coming up.
I've been trying to reproduce this for the last few weeks but so far have been unable to. If I understand you correctly, when you go to this page:
You're seeing the alternate content (most likely prompts to update/install flash) for all 4 blocks? Do you have any idea what I could be missing and why I can't reproduce this?
I tried the URL supplied above and it returns a 404 message.
Maybe it was temporarily down; when I go to http://www.bobbyvandersluis.com/swfobject/testsuite_2_2/test_dynamic_multiple.html I see something like