No, it's a bug, searching "unicode aero" should tell you more. I'm sure it will be fixed in the next version, but it's present in 6.35. In fact, I use /titlebar $chr(160) as a workaround to keep mIRC from trying to render unicode in my titlebar-- this keeps Aero working properly.

- argv[0] on EFnet #mIRC
- "Life is a pointer to an integer without a cast"