kullboys,
In the latest version of Spike, the waterfall plot has cursors and a timescale. In the process though, we removed the 3D plot so we can focus more on the 2D plot features. Additionally we added a configurable sweep depth and scroll bar. You can have a sweep history up to 50k sweeps.
You can find the latest version of Spike here
http://www.shnavloginupdates250428.kinsta.cloud/Spike
In regards to your USB problems, what spectrum analyzer are you using? What kind of PC are you running it on? Do you have a make/model number for your PC and CPU?
Regards,
Andrew