I dont know what happent but something changed on latest version .

I Masquerade internet but not local network but is not working .

When i add this i cannot use 10.0.0.0/8 network

/ip firewall nat
add action=masquerade chain=srcnat dst-address=!10.0.0.0/8 out-interface=Internet-pppoe

I cannot find anything . Anyone who has the same problem ?

I assume 10.0.0.0/8 is your local subnet?
You don't have any other?
Then you can simply omit the dst-address=!10.0.0.0/8:

ros code

/ip firewall nat
add action=masquerade chain=srcnat out-interface=Internet-pppoe