Xpra: Ticket #788: OSX client GUI launcher text displaying as empty rectangles

Using OSX client 0.15.0 r8522 to connect to a fedora 20 0.15.0 r8522 (technically runknown) server...

When trying to launch from the GUI, the text of the GUI all displays as empty rectangles. Likewise, all the About Xpra, Session Info, and such dialog boxes.

I'll attach a couple of screen shots.

The following outputs client-side on connection:

2015-01-21 18:24:33,954 Warning: 'rencode' packet encoder not found
2015-01-21 18:24:33,954  the other packet encoders are much slower
2015-01-21 18:24:33,954 xpra client version 0.15.0

And this when opening the About Xpra dialog:

/Users/Schadenfreude/Desktop/xpra-catalog/xpra-alex8522/Xpra.app/Contents/Resources/lib/python/xpra/client/gtk_base/about.py:88: PangoWarning: No modules found:
No builtin or dynamically loaded modules were found.
PangoFc will not work correctly.
This probably means there was an error in the creation of:
  '/Users/Schadenfreude/Desktop/xpra-catalog/xpra-alex8522/Xpra.app/Contents/Resources/etc/pango/pango.modules'
You should create this file by running:
  pango-querymodules > '/Users/Schadenfreude/Desktop/xpra-catalog/xpra-alex8522/Xpra.app/Contents/Resources/etc/pango/pango.modules'
/Users/Schadenfreude/Desktop/xpra-catalog/xpra-alex8522/Xpra.app/Contents/Resources/lib/python/xpra/client/gtk_base/about.py:88: PangoWarning: failed to choose a font, expect ugly output. engine-type='PangoRenderCoreText', script='latin'
/Users/Schadenfreude/Desktop/xpra-catalog/xpra-alex8522/Xpra.app/Contents/Resources/lib/python/xpra/client/gtk_base/about.py:88: PangoWarning: failed to choose a font, expect ugly output. engine-type='PangoRenderCoreText', script='common'