Subclipse 0.9.15 update breaks my eclipse

Hi,

I have run the update from 0.9.12 to 0.9.15 on Eclipse 3.1M1 and it
breaks my install. I have three workspaces, the one I ran the original
update from now bombs when you first load it up. I deleted all
previous svneclipse plug-ins, went into the second w/s and ran a clean
update from subclipse.tigris.org/update and I can get into eclipse and
switch to the svn perspective but neither of the views can be opened.
The attached log file gives class not found errors.

I've not gone into the third w/s at all yet?

What's the best way of sorting out my completely non startable
workspace? Deleting subclipse and restarting it has no effect.

I am running on Mac OS X 10.3.5 btw.

How can I go back to 0.9.12 should I need to? I tried deleting just
the 0.9.15 folders in plug-ins and features but that did not seem to
make a difference.

Cheers

Jez