I upgraded Opera yesterday and both icons are showing on my homescreen. I went into the applications list to delete the old, and restarted as prompted, and the old icon STILL shows up on the homescreen.
There is now only 1 Opera 4.1 in the applications list.
Uninstall the older version. I had this happen when I installed the beta of 4.1. I ended up with both 4.0 and 4.1. I removed 4.0 which left me with only 4.1. You can also press menu and go to modules. Or if worse comes to worse, just remove 4.1. and see if it rolls back.
Go to Options, Advanced options, Applications...then highlight the one you want to uninstall. Then push the button with the dots (to the left of the trackball) and then hit delete.
Go to Options, Advanced options, Applications...then highlight the one you want to uninstall. Then push the button with the dots (to the left of the trackball) and then hit delete.