On every ptr servers , I found a bug. When realised , the screen of investments won't hide and stay visible. You can't close it. Even when you try to click something like the association , it won't hide. You need to reload. To do it you:
1- Click on an industry
2- Click the investments
4- (Really fast) During the refresh click on close.
=> The screen won't hide.
If you don't understand I made a video on youtube to show you how , and what's the result.