COM port often cannot be found using Arduino IDE 1.0.1

Using Arduino IDE 1.x
1

I remember this is not the case for IDE 1.0.0. After upgraded to 1.0.1, I find it often happens. In fact, the COM port can be found using Windows Device Manager. I must disconnect the USB wire and then reconnect to upload sketch.

The OS is Windows 7 64bit. Is there any bugs in USB COM driver?

2

Weird. Which board are you using? I don't think there's anything different in this between 1.0 and 1.0.1; are you sure it doesn't work the same in both?