Symptoms
For some weird reason I can't see the activities/events below my Visual Studio design window. If I scroll to the bottom of the window, I can see events and lines extending below where I can scroll.
Diagnoses
Canvas size has been changed.
Resolution
To fix:
1. Open K2 for Visual Studio
2. Go to the properties window (bottom-right)
3. In the drop-down, select SourceCode.Workflow.Design.ProcessView
4. Expand CanvasSize
5. For height, increase the value and press Enter
Play around with it until you get the size you need.