I have a project where I want to use a LCD that is SPI (in this case PCD8544) and be able to access an SD card. I'm using different CS pins (10 for the SD reader and 5 for the screen). Most the time things work fine together but at other times there are issues, for example I will have to select a folder twice, or the screen just displays a black line when I attempt to access a certain folder. I know there is nothing wrong with the SD card or the reader because I can use an I2C display with the same project and it works perfectly.
I'm trying this with both a Nano and a Mega 2560 so it's not a low memory issue either.
Can anyone help or give me pointers on using two SPI devices?