Can't replace the Logo

Hello,

finally I was able to install suiteCRM 8 on a plesk. Happy about it. and looks good.

Now the well known issue apears and ofter uploading the new logo it shows this

$Mod_strings.LBL_LOGO

The picture is not shown in the login or elsewhere.

in vers. 7 it was a permission issue. now the folders are obviously changed and I need to know how to fix this?

thanks for your support.
best
stephan