To reproduce:

1. Download the attached project "_TEST DS2 2018.2.5.zip" and open in Unity
2. Open Timeline window
3. Create Empty gameObject
4. Select newly created gameObject and create a Timeline
5. Right click on the Timeline window and select Conversation Track
5. Observe that in Console there is no message printed
6. Right click on the Timeline window and select PixelCrushers.DialogueSystem > Bark Track
7. Observe that in Console there is Warning printed:

"No script asset for BarkTrack. Check that the definition is in a file of the same name and that it compiles properly."

Notes:
- This issue appears on both Windows and macOS
- Compare "BarkTrack.cs" and "ConversationTrack.cs" and observe that the class names are correct, but BarkTrack is in a namespace and ConversationTrack is not

Reproduced on Unity 2018.2.2f1, 2018.2.12f1, 2018.3.0b5, 2019.1.0a4
Not Reproduced on Unity 2017.4.13f1, 2018.1.9f2, 2018.2.1f1
Regression on Unity 2018.2.2f1