Programming
For some reason Google doesn't pick up this problem easily enough, so I'm noting it here. Besides which, I know I won't remember it in two weeks.
If your cygwin processes are dying with a strange error that looks like this:
fatal error - unable to remap C:\cygwin\lib\zsh\4.2.6\zsh\complete.dll to same address as parent(0x1030000)
Then fear not. You may have no idea what is going on, but there is a simple solution.
Using the cygwin setup utility, find and install the rebase package.
Then close down any cygwin packages that you may have.
Then type 'ash' from the start / run menu.
Type 'rebaseall' at the console.
This should fix everything. I have no idea why.