Do you have Tortoise SVN installed? I know the extra columns added by Tortoise CVS work in Opus so hopefully the Tortoise SVN columns also work, although it's not guaranteed of course.
Is there anything I should tell them to help them solve the problem? I've upgraded TortoiseSVN since posting my message here, and the problem is still there. I've been too busy to follow up, but have the time to now.