On macOS, there were reports of Via crashing due to incompatible third-party software. The symptoms are often similar to the ones outlined in the following:

  1. Start Via
  2. Load network, add Network Layer
  3. Click the tool to “Identify Nodes and Links by Clicking on Them”
  4. Move the mouse pointer onto any link or node
  5. Via crashes immediately

If this happens to you as well, you likely have Karabiner installed, which is not compatible with Java applications. Follow these steps to disable it:

  1. Go to the System Preferences > Security & Privacy > Privacy > Accessibility.
  2. You should there see a list of applications that are allowed to use the Accessibility API of macOS.
  3. Disable Karabiner, restart Via, and try again.

Even if you do not have Karabiner installed but have the same symptoms, try to disable other applications listed in the Accessibility pane and see if it helps, as technically, the problem is not restricted to Karabiner only.