Some of you may be aware of this – some of you may not!
If you have MLG you need to have the SLK web part that is provided with download from www.codeplex.com/mlg. If you have this installed already and then install the update from www.codeplex.com/SLK it will remove the option of SLK Observer which you require for some of the MLG components to work.
I hope you will find this informaiton useful.
Alex