Just reporting an issue with the DynDOLOD 3, Alpha 34, related to the UI. When adding a new rule (right click > insert) in the "Mesh and Reference rules" section of the Advanced window, the last line gets pushed down (as expected), but you cannot scroll down to see it. Adding further rules continues to push the last line further down, out of sight. At first I thought it was removing or overwriting the rule that you happen to be right clicking on, but if you remove a rule, it brings the hidden line back up and it's viewable again. This does not happen in Alpha 33.
As a side note, I'm also getting the "Item not found" error that RockGodOne and verrik are reporting, which was introduced (for me) in Alpha 34. This issue is not present when generating LODs in Alpha 33 (which I've reverted back to for now). I'll consider posting logs for that, if I get a chance, but for now I really just wanted to mention the UI thing.