In between La Gorge à Veron and the main sector of Longs Vaux. Sitstart at the bottom of the right arete of Compression, traverse to the left and exit at the top of the boulder as for Compression.
Rain sucks, but broken holds suck even more. Remember, never climb on wet rock in Fontainebleau.
The sandstone becomes brittle, and pulling on it will ruin classic problems. Drying it doesn't help, because it's still wet and weak inside.
All you can do is wait for better conditions.