If you're talking about the whole Tango/Phobos (2 std libs) thing, it's fixed and Phobos won. But now there are optional function attributes such as @nogc (checks that the code doesn't trigger the GC), @safe (memory safety checks) and nothrow that's causing a bit of a problem.
For example, not all libraries are @nogc. So if you want to use some library in your @nogc code and the library is not marked as @nogc, you can't use that library. This is not as bad as the two standard libraries problem but it restricts the libraries you can use.
The attributes are optional like I said, you can just ignore them and write code that uses the GC (not @nogc), code that is not explicitly checked by compiler for memory safety (not @safe) and code that throws exceptions (not nothrow).
Of course this is sort of expected in multi-paradigm languages, like some people disable C++ exceptions. But in D's case it feels like the compiler and library developers' efforts are spread thin.