Internet Explorer 8 causes Machfive to hang Cakewalk plugin manager

I have discovered that Motu Machfive and Machfive2 will hang the cakewalk plugin manager during validation if Internet Explorer 8 is installed. This happens on both XP SP3 and Windows 7 x64. Trawling through the internet I have found similar problems being mentioned with Motu Symphonic Instrument, and Digidesign Pro-tools (not with Sonar of course).
 
Hangups occur in the installers of these products as well, or whenever any attempt is made to load as a VST. DXI's don't register properly.
 
As all these products use I-Lok dongles I suspect the problem lays there somewhere.
 
There are 2 solutions:-
 
1) Uninstall IE8 and use something else.
 
2) Make the following registry change:-
 

a) Using Regedit browse to HKEY_Current_User\Software\Microsoft\Windows\Currentversion\Internet Settings
 
b) In the left hand pane right click and choose add a new Dword.
 
c) Name the Dword   AllowCookies
 
d) Doubleclick on it and enter a value of 1
 
e) Close Regedit.
 

There may be implications with cookie handling with this, but it does solve the problem.
 
Weird !
 
I intend to pass this on to the relevant Tech Support people.