Problem with git on cygwin64 on Windows 10 (2.8.3-1)

Sat Jun 25 21:09:00 GMT 2016

Suddenly git is acting up on me. I have a number of local repos from 
various sources (GitHub, bitbucket, ...) and since a day or two I can't 
push or pull from any of them. Can't even clone fresh repositories.
Mostly I get 'fatal: unpack-objects failed', but also 'index-pack 
failed'. And sometimes just nothing, like an abort without any output, e.g.
 > Thomas@thoni64 ~
 > $ git clone https://github.com/thoni56/cgreen.git
 > Klonar till "cgreen"...
 >
 > Thomas@thoni64 ~
 > $
I've tried running in administrator mode but no difference. I can 
successfully clone the repos from Linux and Darwin so I'm pretty certain 
the problem lies in cygwin git (or something else cygwin... or windows...)
My cygwin git is 2.8.3-1 but reverting to 2.8.2-1 did not help. 
Everything else is up-to-date, windows is Version 1511 10586.420.
Has anyone seen this before? Any pointers? Removing and reinstalling 
Cygwin64?
Any pointers appreciated!
/Thomas
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