I have a weird thing on pages that use a masterpage. Whenever I click a button that use a masterpage I have to click the button twice for the actual desired behaiviour to execute, so for example.. on one page I click a button that is supposed to change the content of a iframe on the same page, when I do that I always have to click the button twice for the actual iframe change to take place. But when I run debug I can see that everything is executed in code behind, but it's not displayed on the page until I click the second time.
What could cause this?
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