I have some problems/issues programming an Arduino Pro Mini 5V with ATMega 328 running at 16MHz. For uploading a sketch I use a USB Serial Light Adapter from DFRobot (http://goo.gl/qWTSR), it has a jumper to sellect either 3.3V or 5V as VCC. The problem: When I set the jumper to 5 V it powers the Arduino Pro Mini but I can't upload a sketch or use it for serial communication. It only works with the jumper on 3.3V. The boad is definitly the 5V version, I tested it by supllying it with 9V on the RAW pin, the output on VCC or a digital pin set HIGH was 5 V.
Is this normal or am I doing anything wrong?
Thanks in advance for any help or comment