The daily build now has a fix for the non-showing buttons problem on MacOS Mojave (10.14). If you have some spare time, we’d appreciate it if you could try it out if you’re a Mac user — whether or not you’re running Mojave — and let us know if there are any other major problems you run into (before we put it into the release candidate build!) because it uses a new version of TclTk. Thanks in advance. Here’s a link to the download page:
Download UCSF Chimera (the Daily Builds table has the fixed version). Note that the fixed version only runs on Mac OS 10.10 or later, whereas the old version also ran on 10.8 and 10.9.