I've noticed that at the beginning of the game whilst on the main screen to select a train route that the game often freezes up and stops working. Meaning the game has to be rebooted. This has been happening since the last major update was downloaded. Also the Livery Editor keeps crashing after about 10 minutes. Especially if moving up and down the multiple layers of the editor
It's not happened to me I've been making loads of liveries for about 40-50 mins, it's been quite stable. If it keeps happening then try and get in touch with support @ dovetailgames.kayako.com
