I'm using #develop 4.3.1 build 9447, which is apparently built against Subversion 1.7.
It was working reasonably well with my svn tree until Cygwin updated my command line svn client to 1.8. Then svn demanded I do a "svn upgrade", which now causes #develop to give errors every time you try to do a file manipulation in the Projects pane.
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Re "reasonably well": I did notice one problem back when I was running Subversion 1.7: it checks .xaml files into the repo with the MIME type application/xml, which causes command line svn to refuse to do a "diff". svn will only diff a file if it either has no MIME type or the MIME type begins with "text/".