Hi Andrew,
You could take a look if there are any JavaScript errors thrown on the page because in order for a successful ajax request to be send there should be no errors on the page.
I have tried to replicate the described issue but to no avail. I have assembled two sample pages with
MasterPage and
RadAjaxPanel and
DropDownList in the content page working as expected on my side. Additionally, I have created a video showing the behavior working on my side. You could take a look at the provided pages and observe if there are any differences at your end.
Regards,
Antonio Stoilkov
Telerik
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