On Mac OS X Fachwerk was affected by a bug of the Java 7 Runtime Environment. Rotated text was not readable on the display, although shown correctly when printed. (Confirmed on Mac OS X java version 1.7.0_51, Linux and Windows environments not affected.)
Running Fachwerk using the Java 8 Runtime Environment solves the issue. (Tested on Mac OS X java version 1.8.0).
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Oracle has released version 1.7.0_55 of the Java 7 Runtime Environment. The bug that affected Fachwerk on Max OS X hat been fixed.
Both the Java 7 and 8 Runtime Environments can be used to run Fachwerk.