I have the same problem since the upgrade to SP2
I moved the used distribution packages to Public, this solved most problems.
But is still cannot select distribution packages with a dependancy.
Our contact created a call on Landesk and they confirmed the issue. Waiting for a update on this.
It looks like this is a bug with the Import/Export feature of LDMS 9 w/SP2. When it imports, it does not apply the owner correctly, but instead defaults it to public even though it might be in My Packages. The workaround is to right click on it (or group), select info and then change the owner.