After upgrading to 1.1.0 the css and icon file paths were incorrect.

The problem was caused by the soap_api_path processing in config_defaults_inc.php.

stripos (and strpos) should not be checked before use as indexes as they 'may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE, such as 0 or "" ' (in my case thet returned '').

The line
$t_path = substr( $t_path, 0, $t_soap_api_path_pos );
replaced $t_path with an empty string.

To get around this problem I replaced
if ( $t_soap_api_path_pos == ( strlen( $t_path ) - strlen( $t_soap_api_path ) ) ) {
$t_path = substr( $t_path, 0, $t_soap_api_path_pos );
}

with
if ( $t_soap_api_path_pos != FALSE) {
if ( $t_soap_api_path_pos == ( strlen( $t_path ) - strlen( $t_soap_api_path ) ) ) {
$t_path = substr( $t_path, 0, $t_soap_api_path_pos );
}
}