Not sure what you are asking. If you sell your house for more than your purchase price, you will make a profit.
Can't imagine why not.
Yes, there will be a special problem if you are thinking you won't have to pay off the balance.
The lender is prohibited from attempting to collect the debt.
But by the same token the lender has no obligation to give you the time of day if you want a lien release without paying the balance. The lender can just ignore you until you offer to pay the balance out of the proceeds. You might have to file a lawsuit to get the court to release the lien.

