Little question regarding blender and video editing. Every time I load a video and for example crop a picture, the preview disappears. This happens both in version 2.8 and in the previous version.
The avi.-file is not big at 500 MB.
My system is the notebook MSI GP70 2PE Leopard with a GeForce 840M. Graphics card drivers are up to date.
I'm grateful for all the tips.
Edit: The operating system is Windows 10
Probably your hardware is overwhelmed.
Blender needs a lot of resources.
Optimal
64-bit eight core CPU
32 GB RAM
Full HD displays
Three button mouse and pen + tablet
Graphics card with +12 GB RAM
Recommended
64-bit quad core CPU
16 GB RAM
Full HD display
Three button mouse or pen + tablet
Graphics card with 4 GB RAM