I can no longer view the serial monitor, the window seems to exist but when I click on it from the taskbar nothing happens. I have installed the latest version of Java and reinstalled the Arduino IDE.
There was a similar problem here but no solution was posted:
JAVA_HOME is in my program files...
- Locate the preferences.txt file (the path is shown in the "Preferences" window)
- Exit the IDE,
- search for "last.serial"
- set it to something like: last.serial.location=0,0,500,500
- restart the IDE
Make sure those numbers are something reasonable. That should put it in the upper left corner if I remember correctly.
Thanks so much, this was driving me crazy!