Many thanks for the helps!
I've switched from Arduino 0009 to 0007, as per the suggestions, and it seems improving quite a lot with very minor glitch.
I've removed multitudes of Bluetooth serial ports such as Port9,10, 11, and so on.
The selected port I've confirmed is Port7.
The only error message at this moment is :
Programmer is not responding. RESET the board right before exporting.
Therfore, I pressed the RESET button on the board right before uploading after compiling the "blink" program. I'm afraid I might have missed the exact timing for the RESET button pressing, though.
It seems that the old problems are mostly gone.
Thanks for the valuable comments and helps.
I'll try to find the good timing for the RESETting.
Bryan