On update from 3.4.0 to 4.0.1 <SelectDropdown> is not shown

[kitkline]

I feel this is a stupid question but cannot resolve it.

When is shift from version 3.4.0 to the latest version the is simply not shown at all. Elements above and below it are there but the is either not present or is zero size or something...

Am I missing a new parameter?

  <SelectDropdown
            data={this.props.data}
            onSelect={selectedItem => {
              this.onSelect(selectedItem.value);
            }}
            ref={this.pickerRef}
            defaultValue={this.props.defaultValue}
            defaultButtonText={this.findDefaultButtonText(this.props.defaultValue)}
            buttonTextAfterSelection={selectedItem => {
              return selectedItem.label;
            }}
            rowTextForSelection={item => {
              return item.label;
            }}
            rowTextStyle={Styles.selectDropdownText}
            buttonTextStyle={Styles.selectDropdownButtonText}
            buttonStyle={(this.props.small !== undefined && this.props.small === true ? Styles.selectDropdownButtonSmall : Styles.selectDropdownButton)}
            renderDropdownIcon={isOpened => {
              faAngleDown;
              return <FontAwesomeIcon icon={isOpened ? faAngleDown : faAngleDown} color={"#337ab7"} size={12} />;
            }}
            selectedRowTextStyle={Styles.selectDropdownRowText}
            disableAutoScroll={false}
            showsVerticalScrollIndicator={true}
            dropdownStyle={Styles.selectDropdownRow}
            search={this.props.search}
            searchInputStyle={Styles.selectDropdownSearchText}
            searchPlaceHolder={'Start typing...'}
            disabled={this.props.disabled}
            searchPlaceHolderColor={'#337ab7'}
            renderSearchInputLeftIcon={() => {
              return <FontAwesomeIcon icon={faSearch} color={"#337ab7"} size={12} />;
            }}
          />