You don't really have to ditch your save-game. You can switch the provinces with a little patience by editing the save-game file. I guess I should've said this before. Doh.
*Let's say you land in Ghent succesfully.
*Save the game.
*Open the game console by pressing F12.
*Type "showid" in the console without quotes.
*Hover your mouse over the Ghent province and keep it on top of it. At the lower right corner of the screen the ID number of the province is being displayed. Write that number down.
*Quit the game.
*Find the save game in Windows Explorer (doomsday\scenarios\savegames\name of your savegame.eug) and open it with notepad (better back it up).
*Press Ctrl+F or open the search box through the menus.
*Type "tag = USA" without quotes and press search. You will find alot of results in "relation" lines but you want the one right after "country = {", like this:
country = {
tag = USA
*With this specific "tag = USA" highlighted press CTRL+F again and search for the first "controlled" result, without quotes. This will bring you to the USA's list of controlled provinces. Add the province ID number you wrote down previously at the end of the list. Now you control this province.
*But since you and Belgium can't control it at the same time, you need to remove Belgian control from Belgium's list.
*So here we go again, by searching for "tag = BEL" find the line
country = {
tag = BEL
then search for "controlled" without quotes and you'll find Belgium's list of controlled provinces. Remove the province ID number from the list, save the file and fire up the game.
Two things may happen, I don't really know: with a province in your hands you can start supplying your army with your own convoys. Once you move and start capturing other provinces, they might fall to your control as you're attacking from a controlled province. If they do get liberated back to Belgium I think your troops will still be linked to supply as long as they disembarked in the province you control. Or this won't work at all for one reason or the other.
Do you still have that save-game? I'd sure like to try this and see if it works. It's ridiculous to have to land in Germany because of a stupid "bug".