I'd mark this, with Ann's comment, as best answer, but in this case I think that's for Robert to do, if the explanation makes sense to him.
But I do think the result--a full 196cM match--is almost certainly false. One interesting addendum is that I had previously uploaded my AncestryDNA data to FTDNA, and decided to buy a new Family Finder test during the last sale just to see their results with their new GSA chip. The Family Finder atDNA test returned 2.28% no-calls, which is very definitely on the high side.
I have a single X-chromosome. The AncestryDNA and the FTDNA tests both looked at exactly the same chromosome. But using the FTDNA Chromosome Browser to compare the two kits, with a threshold of 7cM set, here's what the graphic looks like:
There are actually 7 segments of 7cM or greater shown in the detailed segment data, but only 5 shown in the "chromosome view"; omitted are segments equalling 12.11cM and 22.05cM. I have no explanation why the graphic view disagrees with the detailed view.
Lacking even more of an explanation, to me, is that the comparison equals a total of 7 segments, 11,575 SNPs compared (the X is about 155.2 million base pairs in length), and 138.63cM. The difference in microarray chipsets I understand, but I don't think that's enough to explain the loss of 57cM--about 30% of the chromosome--when comparing two identical haploid chromosomes.
So Robert has what looks to be a relatively distant cousin with whom FTDNA shows him as sharing 100% of the X-chromosome, and I have two identical X-chromosomes shown as sharing only 70.7%.
It might be worthwhile, in the future, digging a bit to see if my unusual result is a one-off oddity, or if there is a repeatable pattern of anomalous data being reported.
Oh; a quick relevant but not pertinent aside. When the testing companies report X-chromosome data for males, the raw data show that the entire chromosome is homozygous. Males only receive a haploid X--meaning one of a pair of chromosomes (diploid). Since the basic reporting formats from our genotyping microarray testing companies show a pair of alleles at each reference sequence, in the report they simply duplicate the single allele at each X-chromosome position. In other words, a male's X will always look like: AA, GG, AA, CC, TT and so on, rather than heterozygous alleles, one nucleotide on one arm of the diploid chromosome, and a different value on the other arm.