But can you tell me how you actually resolved this problem?

vekipeki, I resolved it by not using arrows in the title—although you can specify fonts through CSS, these rules only take effect inside the viewport. Styling of the browser chrome (including the titlebar) is controlled either by the operating system or by the browser itself (e.g Safari does render the arrows). I don't know how Safari does it—perhaps it substitutes Tahoma for glyphs in another font? But in terms of web authoring you can't do anything about it. (Or if you can, then you shouldn't!)