For some reason TF is currently not pulling color aerials for the state of Arkansas. Here is how to add a different server using the WMS server capability.
Go to:
Window->WMS Custom Servers
Click on the "Add new server" button
Enter the following info:
Name: Arkansas
Server: imsortho.cr.usgs.gov
request: wmsconnector/com.esri.wms.Esrimap/USGS_EDC_Ortho_Arkansas?Version=1.1.1&SERVICE=WMS&request=map&reaspect=false&format=image/jpeg&transparent=true&SRS=EPSG:4326&styles=&REQUEST=GetMap&layers=AR_State_1.0m_Color_Jan_2006_05,AR_State_1.0m_Color_Jan_2006_04,AR_State_1.0m_Color_Jan_2006_03,AR_State_1.0m_Color_Jan_2006_02,AR_State_1.0m_Color_Jan_2006_01
Hit "save changes."
You may want to assign it to the first shortcut key by hitting the "Set as
shortcut key 1" button. (then the number 1 key will switch to Arkansas
tileset).
Note that the request string is very long and should all be on one line. All of
it needs to be there, otherwise you will get an error message.
I just tried this and can get nice color aerials for everywhere I've tried
in Arkansas.