The phrase "unresolved problems" refers to issues or challenges that have not been solved or fixed yet. It means there are still things that need to be figured out or dealt with. Full definition
One of his more ambitious ideas of the time involved painting a large nude from a series of photographs, but he set the project aside due to unresolved problems with color and texture. (dreamideamachine.com)
So the financial aid administrator will be able to tell you which lenders have more unresolved problems. (finaid.org)
Now the biggest unresolved problem is filling the pot. (caneurope.org)