This is interesting! I know what’s causing your issue now.
You are missing hardware acceleration. The app, for some reason, does not get access to run on your GPU! Does the computer you are using it on have a GPU? Does it work better if you use our website (charts.navigraph.com)?
Unfortunately, we do not support Windows 7 as per our technical specifications. This means that we can’t do much to help you. It should work though, so it is probably fixable somehow!
In order to tell whether or not you are running the app with the help of the GPU, you can look for the Mapbox logo in the corner! Additionally, the app is very laggy when running without the GPU, so that should be a hint too.
I am sorry that I can’t help you further, and hope that you manage to resolve your issue!
Kind Regards,
Malte