Originally Posted by paulitzlee2
Is it possible the windows just need re-sealing? This never happened before.
It is possible that the drains on the outside of the windows are blocked. These are located at the bottom of the frame and can clog with dirt, mold, other yuck. If they clog then the window rails can fill with water - rain from outside and condensation from inside - and leak down the inside wall.
To fix, unfold a paperclip and make sure they and the window rails are clean. Then use a hose and rinse well. This will tell you if you still have a problem.
Hope this helps,