Just in case anyone is comparing the results of ctests, I wanted to make sure you do not confuse a change in the tests with a change cause by LyX or a patch.
Although it is not our goal (in fact we would be happy to have unit tests that abstract away from these issues), our tests caught a regression in l3kernel. I reported the issue here http://tug.org/pipermail/tex-live/2016-January/037586.html after updating to TL 2015 caused a test to go from passing to failing. Yesterday or today's update fixed the regression. The test is: EXAMPLES_export/examples/colored-boxes_pdf5_texF Scott
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