Dunno if anybody else had the same problem. I (USA), allied with Texas, was fighting Mexico, and won some battles. But Mexico still occupied two or three Texas provinces, while I had none of the Mexican territories. Then Mexico offered a white peace, but I could not see any information (prestige/infamy/militancy gained) anywhere, only after I accepted the white peace (because I didn't want to continue the expensive war) did I find I lost 10 prestige.
I guess the same problem happened to OHG when he played France in beta test, and lost 10 prestige after accepting peace with the Ottoman in the Ottoman invasion of Tunisia, and he didn't really know why he lost the 10 prestige.:wacko:
Did you lose the prestige because you didn't achieve your war goals?