I've found a potential bug that I've been able to reproduce quite consistently, and causes the game to completely lock up and become unresponsive (I'm on a Mac, so spinning beach ball). I've tried this with multiple networks, both roads and decorative, and the same issue occurs every time.

Steps to reproduce:
1. Select a network, and drag out a short (approx 4U in length) segment.
2. Use a mod (Network Multitool, Electrix's Road Tools etc.) to insert a node roughly at the center of the segment.
3. Open Move It, select the node on the left, and ALT+Drag it out to make a much longer segment.
4. Select all 3 nodes, and click "Line up objects"
5. The game will instantly lock up and become unresponsive, and needs to be Force Quit

If I can provide any further information, please let me know!