Hi @Glennon,
Thank you for your report. I can create a basic Blinky program linked to mbed-os 6.17 and flash it to an LCP1768 with some printf output appearing in my serial tab (Note however that I’m using the updated firmware for the board found here: New beta firmware for LPC1768).
Can you confirm you’re on such a version? It’d also be helpful to see the exact code you’re flashing and what operating system you’re running Mbed Studio on.
Carey - Studio Team