There was a change in the way one of the color aerial servers is accessed recently. As a result, current versions of TopoFusion Pro and unable to download color aerials for the east coast and a few other states like Texas and Oklahoma.
We've corrected the issue and released a beta version (see beta forum for info) that you can download if you are a registered user.
We plan to release a full public version with the fix in the next couple days. As a side bonus, we also added color coverage for the state of Maine.
Note that if you have already downloaded color aerials you still have them. This issue only affects download of new aerials.
Thanks for the patience on this, and also thanks to the users that pointed out the problem.