This is not true. Mapsource can detect the 60CSx without having the GPSr in removable drive mode.
Since the 60CSx can be connected with USB or serial, I assume you are using the USB cable and have it plugged into the correct port on the computer.
But do run this test: connect the 60csx and PC together put the 60CSx into removable drive mode (Setup, Interface, USB mass storage) - the GPSr will display an icon that suggests it is in that mode and your computer should respond by setting up a drive (you can see it with Windows Explorer). If this does not work then there is a defect in either the USB port on the 60CSx, the port on the computer, the cable or one of the connectors on either end of the cable. If that is working fine, and you can copy files back and forth, then the problem is elsewhere. On rare occasions something has gotten Windows confused so the USB ports stops functioning and restarting Windows might help. I have also seen situations where a device was plugged into one of the USB ports that was causing the whole bus to not function right; so you might want to run tests with all other USB devices removed and the comptuer restarted to see if that clears up the problem.
If this test indicates that your hardware is OK, then try the following. Take the 60CSx out of USB mass storage mode (press the power button) and in Windows go to Control Panel, Device Manager - there should be a line for "Garmin Devices" and under that your 60CSx should be represented. If this is not present then something is wrong with the driver. Uninstall it, make sure you have the most up-to-date version and reinstall it. The best way to check to see if Mapsource is able to see the GPSr is to try Transfer, Receive and watch the dialog that comes up. After two or three seconds it should show the GPSr as the connected device.
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Thanks Hynr for all possible implicit solution of my problem. I'll all processed and I'll communicate the results. I hope to solve the problem.
Greetings, Robert