Many of the GUI clients (such as svnX on MacOS X) do not know what to do when they do not recognize a SSL certificate.

If you are running a recent operating system, the certificate should automatically be recognized, but if it is not you will need to verify the fingerprint locally first. To do this, log in via the command line client. You can issue any command against the repository (ie, svn ls https://wush.net/svn/youraccount)

You will be prompted to validate the certificate manually. The certificate information should match the following:
Certificate information:
 - Hostname: www.wush.net
 - Valid: from Apr 14 00:36:19 2014 GMT until Sep 11 15:12:18 2015 GMT
 - Issuer: See www.geotrust.com/resources/cps (c)06, GeoTrust Inc, US
 - Fingerprint: ab:00:fc:f5:24:1a:64:cb:6f:cf:90:94:79:f8:c9:ab:d9:1c:eb:e2

Choose to accept the certificate permanently. Now you should be able to use your GUI clients without trouble.