Biber broken?

I had a happily working version of Biber until I did a MikTeX 2.9 update
last week (I usually update once a month). My installation reports it is
fully up to date. Now when I run Biber, I get thousands of warning messages
like:

"Use of uninitialized value in lc at (long path in
AppData\Local\Temp\par*\Biber.pm line 419 ..."
"Use of uninitialized value in lc at (long path in
AppData\Local\Temp\par*\Biber.pm line 424 ..."

ending with
"Use of uninitialized value in $snksn at (long path in
AppData\Local\Temp\par ... \Biber.pm line 87 ..."
"Use of uninitialized value in $lsnksn in concatenation (.) or string at
(long path in AppData\Local\Temp\par ... \Biber.pm line 799"

followed by hundreds of

"Use of uninitialized value in string eq at (long path in
AppData\Local\Temp\par ... \DataModel.pm line 201"
"Use of uninitialized value in string eq at (long path in
AppData\Local\Temp\par ... \DataModel.pm line 204"

ending with
"Can't locate object method "get_userprefix" via package
"Biber::Entry::Names" at (long path in AppData\Local\Temp\par ... \Biber.pm
line 2363"

I tried a minimal example and am still getting basically the same result.
Minimal example follows.

Machine running Windows 10.

Comments?

Thanks!!
Dan


\documentclass[]{article}
\usepackage[autostyle]{csquotes}
\usepackage[
    backend=biber,
    style=authoryear-icomp,
    sortlocale=de_DE,
    natbib=true,
    url=false,
    doi=true,
    eprint=false
]{biblatex}
\addbibresource{biblatex-examples.bib}
\usepackage[]{hyperref}
\hypersetup{
    colorlinks=true,
}
\begin{document}
    Lorem ipsum dolor sit amet~\citep{kastenholz}.
    At vero eos et accusam et justo duo dolores et ea
rebum~\citet{sigfridsson}.
    \printbibliography
\end{document}
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