I have a sketch that I'm working on that has been uploading fine for a week and now I can't get uploading to complete (using V.1.0.1). I'm using a Seeeduino Mega board (and have been for many months without any problems). I'm not getting any visible errors reported in the IDE for this sketch (and normal compile completes without errors), it just won't finish an upload cycle on this specific sketch. I can upload other sketches without problems. Here's what it looks like when it hangs:
When it begins to upload, the TX & RX LEDs blink for a bit (as expected) and then it appears the pin13 LED is lighted and it hangs (I'm not using the pin13 OUTPUT in this sketch). If I shutdown the IDE and remove/reset power to the board, it doesn't seem like its running any program and the pin13 LED appears to blink in a sequence (2 quick pulses, OFF, repeat). I'm a little perplexed, appreciate any help.