When I run a sketch involving use of the SD card interface and then follow it with a sketch that uses Ethernet in order to get the Ethernet sketch to execute properly, I have to eject the SD card. I can re-insert the SD card immediately but it must be first ejected to get the Ethernet sketch to run properly. I haven't tried a sketch that combines the use of both peripherals in the same sketch.
For example I run the SD example sketch ReadWrite followed by the Ethernet example sketch WebServer.
Has anyone else had a problem like this?
D4 is controlling the SD card CS on my board and D10 is connected to SS of the Wiznet 5100.