[szemigi]

Hey, I'm using Fceux 2.2.3 and after I modificated a Famicom ROM file (like letter graphic or something elses besides graphics, I cannot see the graphic changes in the PPU. I used YY-Chr and I pressed +1 to correct the set of the graphics. What can I do? Because earlier Fceux doesn't do this!

[KingMike]

I think you might be calling both cart and disk games "Famicom".
We usually use "Famicom" to speak of cart games and "FDS" when talking about disks. It might be important to distinguish them.

Could you be using savestates which might revert your changes to a previously-loaded state?

I am not sure which method different versions of FCEUX might be using for FDS games but some might write saves back to the original disk ROM while some will write to a backup copy automatically created.
If you use savestates on a FDS game, it may very likely be reverting your changes. (as the entire disk could potentially be writable)