Thanks, Bruce.
I appreciate knowing that you have no problem with W8 and IE10, but so far I have no success.
A quick summary of my efforts:
I DO have all Windows 8 and Internet Explorer 10 and Clarion 8 and Clarion third party updates installed.
What works for me is if I boot from an up-to-date HD running Windows 7 Pro with the latest IE10 - the same IE10 version as on my Windows 8 Pro HD.
On each hard disc I can run a copy of web33.exe.
The Alias drop down seems to work as expected under Windows 7 but not under Windows 8.
On the W8 HD, I have also run the latest Firefox, Chrome, and Safari, and each seems to handle the web33.exe Alias drop down as expected.
From my internet research on Microsoft and other sites, it seems that IE10 is 'built-in' in W8 and older versions of IE cannot be installed alongside, or over the top of IE10.
Also, it seems unlikely IE10 can be -removed- from W8.
I did download an IE10 installation file from Microsoft, thinking I could run it over the top of the existing IE10, but it will not run as it says that there is a newer version of IE10 currently installed.
In IE10, I have used the F12 key to experiment with the Browser modes offered, but this approach was not useful.
So, it seems that I am stuck with the IE10 that is on the machine.
I will load web33 on to another user's machine to see if it works.
Even if it does, it seems I will not be able to go further on mine.
My alternative is to not use the drop-down control in my web program.
Thanks for your efforts.
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