Same here in Luxembourg.
This probably is due to the fact that the last BING data update seem to concern specific lods.
Oddly enough, the ground LOD seems not to have been affected by those BING data update.
As an example, above a specific altitude, let say you are at LOD1, then when you go down this altitude, the tile switch to LOD0.
It seems to me that, until LOD1, BING data are up to date, but in LOD0, this is not the case.
So, if a BING texture displays a field at summer with the new update, the LOD0 one still displays the old texture (which can be a spring texture). So that’s why the colors are heterogeneous.
In Luxembourg, this is more noticable near the new Luxembourg stadium, as you can see the stadium footprint with the new BING data, but this footprint disappears near the ground, as it displays the old BING texture.