This already bugs me since ages. And it really suprises me, that this is not reported more often:
Then and when the map preview in the loading screen displays a small image in bad resolution and with missing objects (resources, obstacles, Xel’Naga towers).
I could not determine yet under which conditions this occurs. During an evening gaming with the same team mates, even the same map is shown correctly and before another match broken again. When this occurs, all players seem to see the same broken image (at least always all my team mates do).
Did not count, but this occurs quite often, est. every third ladder match.
And it already since years, litterally.
I’ve uploaded a screenshot here:
postimg.cc/Fd40kzbT