Time constraints I believe.

In addition, Jum (Jens Uwe-Mager) provides all of the patches in the jum build to the LW team, who incorporate them into the official build. The impression I get, however, since many of these bugs are minor, they are put near the end of a long list of things the programmers need to do. I am not criticizing them in any way, I am agreeing with them in their recognition that certain aspects of development and bug fixing take precedence over minor OS X bug fixes. In the meantime, use the jum build.