Buffer sizes back to default after restart smartftp

I am new with smartftp 2.0
I am using it for a week now and i have this prog for my LAN.
I read the help file and set File Transfer Buffer and the Send Transfer Buffer to 65536 in the Settings from smartftp.

my lan goes to 100% at 100Mbit LAN, but for strange reasons the buffer sizes changes switch back when i do a restart of smartftp?

does anyone know this problem and how to solve it?

i have a 20% boost when setting higher buffer sizes and really want to explore the world of FTP instead of xp shares.