Invisible text on Retina iMac running Yosemite

When creating a new schedule or opening an existing one the text in the selected field is invisible (white on white) when selecting any other field the text turns light blue regardless of the specified colour. This is only happening on out new 17" Retina iMac running 10.10.3 and FastTrack 10.0.5. 

Schedules created on this machine look fine when opened on another machine.

Please Help


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