everytime i try to click the button, a page opens, and plain says:
" <div class="announcement" style="width:600px;margin:0 0 20px 0;">Are you sure you want to mark this trade as done? There's no way to reopen it in the future, so be absolutely certain before clicking 'Yes' below.</div>
<div>
<form action="/trade/3911909/done" method="post" style="display:inline-block;">
<input type="hidden" name="session" value="284eb48943b617c390ea3589dc13306f" />
<input type="submit" class="button" value="Yes" style="margin-right:6px;" />
</form>
<button class="button" onclick="$.fancybox.close();">No</button>
</div>"
i understand what that means, but i dont know why this is happening. tried to deactivate and activate my java plugin (if that helps) and also did a hard refresh :/