Using vimdiff for merging with Unison File Synchronizer

Hi

The File Synchronizer Unison has the possibility to merge two versions of a file both of which have been changed. Unison is perfect for use in a shell, so using it with vim as the merging tool would be perfect, too. The problem is that using a simple
"vimdiff CURRENT1 CURRENT2"
just does not start vim. The two best links regarding this are the following:

http://trembits.blogspot.co.at/2010/02/merging-unison-conflict-with-vim.html
http://hash-bang.net/2009/08/ia-merging-unison/

Their solutions are workarounds, one starts a screen-Session, the other uses gvimdiff. But it would be better to have it working directly in the terminal session.
So my question is, does anybody know what kind of problem this is?
I've tried some options like -debug or -V, but there is no possibility to get more information out of it.

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