JabRef 3.6dev--snapshot--2016-07-29--fix1639--e838541
windows 10 10.0 amd64
Java 1.8.0_101

Steps to reproduce:

1. Select an entry. The entry preview (correctly) appears at the bottom of Jabref.
2. Now select several entries, e. g. the first two entries below the entry you had intially selected. I've done this by holding SHIFT and clicking onto the last entry I want to select.
3. Three entries are now selected. The entry preview of the initially selected entry is still visible. So far, so good.
4. Now select another entry among the three entries that you selected beforehand. This is now the only entry that is selected (indicated in "blue" by Jabref). The entry preview, however, is not updated properly. It still shows the entry preview of the entry that you had selected at the start.
5. If you select now another entry and then go back to the entry selected in 4), the entry preview will be updated correctly.