There is no problem to be solved here, I just experienced a very strange behaviour on the part of latex - have you ever experienced something similar?
After having made a clean new installation of Ubuntu 12.04 (I moved from Mint 10), I set to work upon a tex file that I had used on the old OS. Then, somehow, without any change in the file, \textcite{X} produced not, as it used to, X (year) but X (title). I then started to make a minimal example, but could not reproduce the new output, but got what I wanted X (year), even after including the whole preamble. Then, I run again pdflatex, biblatex (2x), pdflatex (2x) on the original document, and I got what I wanted. The strange thing is that I got two different outputs from the original file, without changing a letter in the file nor in the installation.
So, after all, there is no problem, just an hour or so wasted.
Has anyone made similar experiences? Or has someone an explanation for this? (Other than me being silly)