LG through BIRD line 1000; I'll look at the rest after lunch.

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Src/LexText/Interlinear/BIRDInterlinearImporter.cs line 865 at r1 (raw file):

				foreach (var item in word.Items)
				{
					if (wordForm.Analysis.CategoryRA != null)

What besides line 880 wordForm.Analysis.CategoryRA = cat; might set CategoryRA in this loop?

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Reviewable status: all files reviewed, 2 unresolved discussions (waiting on @jtmaxwell3)

Src/LexText/Interlinear/ITextDllTests/BIRDFormatImportTests.cs line 827 at r1 (raw file):

					ISegment segment = imported.ContentsOA[0].SegmentsOS[0];
					// Verify that we found the category.
					Assert.True(segment.AnalysesRS[0].Analysis.CategoryRA.Equals(cat));

nit: you could get more helpful error reports from

Assert.That(segment.AnalysesRS[0].Analysis.CategoryRA).Is.Equalto(cat);