ASP timer in update panel works locally but not remotely

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I created web part for sharepoint 2010 for chat. It has two placeholders wrapped in update panel, which is triggedered by button. First placeholder contains button and allows user to enter some relevant data. Second placeholder has another update panel triggered by asp:timer control.User enters some data, clicks the button, and view is refreshed: first placeholder is hidden and second one becomes visible and timer is enabled. Communications works as it's supposed when I'm testing it on my local machine. But when I deploy my solution into production, connect and try to chat from my browser, it looks like timer is not beeing activated - it doesnt initiate postback.