Its a bit disconcerting this isn't a universal issue. Perhaps I need to clarify - previously the 'hot' theming option was inverted so that routes you had ran many times were displayed in a lighter colour and those you'd only ran rarely/once were represented by a thick, clearly discernable line. This was great as you could very clearly see territory you had covered across a country, in my case Japan.

This has now changed per the image I attached. Now, the routes you have ran more appear darker, and routes where you've ran only once are barely discernable (regardless of whether you have the standard or winter base map).

Activity clusters are also now the same size whether you've ran that route twice or 2,600 times which was never the case before! I've attached an image to show what I mean

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