A little while ago, PSI made some changes to the SVN hosting. The main SVN URL seems to remain the 
same, but SVN viewer moved to a new URL (it seems a bit faster compared to the old viewer): 
https://savannah.psi.ch/viewvc/meg_midas/trunk/

Also the SSH host key has changed to:

savannah.psi.ch,192.33.120.96 ssh-rsa 
AAAAB3NzaC1yc2EAAAABIwAAAQEAwVWEoaOmF9uggkUEV2/HhZo2ncH0zUfd0ExzzgW1m0HZQ5df1OYIb
pyBH6WD7ySU7fWkihbt2+SpyClMkWEJMvb5W82SrXtmzd9PFb3G7ouL++64geVKHdIKAVoqm8yGaIKIS0684
dyNO79ZacbOYC9l9YehuMHPHDUPPdNCFW2Gr5mkf/uReMIoYz81XmgAIHXPSgErv2Nv/BAA1PCWt6THMMX
E2O2jGTzJCXuZsJ2RoyVVR4Q0Cow1ekloXn/rdGkbUPMt/m3kNuVFhSzYGdprv+g3l7l1PWwEcz7V1BW9LNPp
eIJhxy9/DNUsF1+funzBOc/UsPFyNyJEo0p0Xw==

Fingerprint: a3:18:18:c4:14:f9:3e:79:2c:9c:fa:90:9a:d6:d2:fc

The change of host key is annoying because it makes "svn update" fail with an unhelpful message (some 
mumble about ssh -q). To fix this fault, run "ssh svn@savannah.psi.ch", then fixup the ssh host key as 
usual.

K.O.