I purchased SU 2018 Pro last year and upgraded to 2019. Everything was fine until I thought there is no need to have both versions in my computer . I uninstalled 2018 and problem starts by files appearing as a blank documents . I contacted sketch up Help , but nothing suggested could fix this problem. I reinstalled the version 2018 and problem solved!
Again after few months my computer started to work slowly and I thought to uninstall the 2018 version one more time. The problem appeared to be the same. I have attached a picture of how the files look like in here. I am wondering if someone could tell me what is wrong and how to fix it. Thank you.