Steps to reproduce:

1. Choose a graph from Monitoring > Graphs and add it to 'Favourites graphs' with the 'plus' button.
2. Still on Monitoring > Graphs, in the hosts groups drop-down choose a group which does NOT contain the host to which graph from step 1 belongs.
3. Go to Monitoring > Dashboard, click on the graph in 'Favourite graphs' that was added in step 1; you should see something other than the expected graph and the host group drop-down will probably still be that chosen in step 2.

I'm unsure whether I saw this same issue back in 2.0.2. It would be helpful if others can to reproduce this on both 2.0.4 and 2.0.2.