Cubase 8 Crashes when opening project.

Hello everyone.

I have a new issue with Cubase which is really annoying.
When I start a specific Project, Cubase loads it and then crashes when the window opens.
I tried renaming the preferences folder so Cubase creates a new one but that didn’t help.
The only thing that temporarily helped was delete the standard vst plugins folder.
When I did that it opened once properly but when I wanted to open it again it crashed again.

I hope some of you have any ideas about what the problem is.