I've recently started using Code::Blocks and enjoy it very much, so thanks for all the hard work you're putting into this tool.
I'm playing around with the nightly builds to keep myself updated with the latest and greatest, but I thought I would drop you a line concerning this build where I've found a little visual bug. I don't know whether this is known or not (please point me to the correct location to report/discuss bugs if this is not the place for them), but the "X" button on source file tabs on the top of the editor pane/window appears where it shouldn't.
It's reproducible (at least for me) by opening as much files as are needed in order to get at least two pages of tabs in the tabs pane (so you need to use the arrows to the right in the tabs pane to switch between the pages). Select a page and a tab, change to a different page, then move the mouse pointer inside the tab pane, followed by moving the mouse pointer anywhere outside the tabs pane. At this point, the "X" button from the previous page becomes visible on the current page at the same location, but it's (thankfully) not clickable.
I'm using todays build (unicode) and windows XP sp2. I've tried all the different tab "skin" flavours available in the environment options dialog and get the same results with each one of them. Hope this helps.