Okay, actually, this was fixed in my local copy (back in April), but because I had been working on some other functionality, I never pushed it. I've done that, now.
All you need to upgrade to the latest development release (asuming you are using 1.1.0b20140331) are the following two files from rev. 936249:
You may grab each of these by browsing from here.
With those two files, your installation will be up to 1.1.0b20140425.
Please advise as to whether you continue to have difficulties with the header logo image, Joerg.