On the Windows builds, when OpenGL rendering is enabled many of the text labels are rendered with little or no contrast to the background. Noticible in the StartCenter, the Help -> About, on tooltips and on some of the Main menu dropdown entries.
Was OK through
Build ID: 29e0b587df4e509558c22fa478992b07486828d1
first noticed with
Build ID: 1fc4af8695ae0ffb7590198e0d3791a19084a99b
So looks to have been introduced in this range...
Version: 18.104.22.168.alpha0+ Build ID: c0d7dfa56c8a335bdea1be2ddce33a0f19b28bbd
Oh, I fixed this in  I think. This should be a problem only on master.
On Windows 10 Pro 64-bit en-US and Windows 8.1 Ent 64-bit en-US with
Build ID: 58959a946c0a412c3f997d8511eacb316626cd42
CPU Threads: 8; OS Version: Windows 6.29; UI Render: GL;
TinderBox: Win-x86@39, Branch:master, Time: 2016-06-15_12:04:53
Locale: en-US (en_US)
Setting this resolved fixed, but now have bug 100411