With the new Mac operating system Mavericks (Mac OS 10.9), typing into Chimera entry fields is not working in 64-bit Chimera but works correctly in 32-bit Chimera. Also as reported earlier a Mavericks graphics driver bug causes Chimera 1.8 to crash displaying any atoms or bonds. The crashing problem has been fixed in today's Chimera daily build (by disabling an advanced graphics feature automatically on Mac 10.9). So the only Mac Chimera that will work correctly on Mavericks is today's 32-bit daily build (or newer). Tom