Leonardo COM port disappears after upload

Development Tools IDE 1.x
1

Hi everyone,

I'm currently having an issue with my Leonardo where the COM port disappears once the Leonardo exits the bootloader. This means I can't use any USB serial communications with it, and in order to upload a program, I have to reset the board and trigger the upload while it's resetting.
I have tried uploading the Blink example, as suggested in other forum posts, however this doesn't fix the issue.
I can use an Arduino Uno as an ISP to burn the bootloader to the Leonardo, and doing so causes the COM port to reappear (Arduino Leonardo bootloader when resetting, and Arduino Leonardo when running the default program), however as soon as I upload any program to the board the COM port that's used for the program disappears (bootloader one stays present when resetting).

Does anyone know how to fix this issue?

The fact that flashing the bootloader fixes it temporarily indicates to me it might be something wrong with how the Arduino IDE is set up on my system.

I'm currently running Arduino IDE v1.8.13, and my OS is Windows 10 Version 2004.

Thanks in advance

2

Does this happen with any sketch (including e.g. the empty sketch or blink) or specifically with sketches that you wrote?

3

Was happening regardless of the sketch.
Managed to sort it out, turned out my Arduino IDE install was in fact borked, though I'm not quite sure what specifically was messed up.
I ended up doing a clean re-install of the Arduino drivers and IDE, which seems to have fixed it.

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