An old IBM ThinkCenter with lots of USBs

I use COM15 (one of the ports on my NEW USB 2.0 card) and I choose it in the IDE menu for selecting ports - it CAN show a small window when I request board infos, but ...

when I upload my sketch I get this (copied from screen):

I just explained in text what happens

Trying to help, but your description was not clear enough.

I wonder if this information would help as it seems to describe the problem you are having.

It looks from the solutions that it's a driver problem and uninstalling the driver for the Serial->USB device and letting the OS re-install it solved the problem for them.

YES YES YES YES ... it did the trick !!!!!!!!!!!!!!!!

Many big THX THX THX :rofl: to mark833 !!!!!!!!