Hi

I had the same problem.  I tried reloading over the original Arduino 1.0.1 folder as well as creating a new directory and having a second copy.  Neither of these worked and I kept getting the message that COM8 was already in use.

In the end I checked which Arduino board was selected.  Some how the IDE had lost its original setting of ATmega1280 and had defaulted to the first board on the Tools/Board menu.  Resetting the board to ATmega1280 fixed the problem.

Hope this helps someone

Jayne

Hi Guys

I have been having problems with reading the time on my ds1370 and your discussion may be pointing to a fault on my rtc module. 

When Initally setting the time, I was able to get it close to the computers clock just by resetting the Arduino 2 seconds before my preset time.

I can Set and initally Read the ds1370 ok using code similar to the Wire only code listed in this discussion. When I disable the clock setting  code so that it only reads the time, it is always 19 seconds slow. This discrepency is constant over several days. I have tried several sketches to read the time, including one from the Arduino Cookbook and the result is always; about 19 seconds slow

I found it intresting that your problem involved about the same 19 seconds that mine is slow by.  I think I will have to get another RTC module.

Jayne