Once in a while T+ starts refreshing after an ActiveSync (the Weather section text turns grey) and it never comes back (it stays grey forever).
What's the best way to reset it so that the Weather section shows normally again?
Is there a known cause and solution to this problem?
It happens rarely to me too. And as you know it happens while fetching data from web (RSS feeds / weather). Cause can be anything from absence of .NET SP2 to something else but I don't think we are sure of what is causing it.
As for the recovery out of it, mostly disconnection ActiveSync and starting again solves it while twice in my use of TP I had to soft reset (even TP reloading was not helping me at those times).