You can see the condensation at the top of the image in RCF's photo ... well it grows until the whole dome is obscured then we have to wait until it clears before we can see the birds. We have got some dessicant inside the housing to hopefully help out but we will probably be playing switch-switch-back as necessary until the problem is resolved.
BTW the bird in RCF's image is Brooklyn - he of the neon white breast and cheek patch ... Hurricane's cheek patch looks blurred or smudged ...