Probleme when editing an OpenCmsString with HtmlWidget defined

Hi guys,

I have a little Problem with an OpenCms 7.05 Installation regarding the
editing of content.

I have a content-element "TextField" which is an OpenCmsString, but have defined to use
the HtmlWidget for editing that "TextField" (see below)

        <xsd:complexType name="OpenCmsHomeSite">
                <xsd:sequence>
                        <xsd:element name="HeadImage" type="OpenCmsVfsFile" />
                        <xsd:element name="TextField" type="OpenCmsString" />
                        <xsd:element name="Download" type="OpenCmsDownload" minOccurs="1" maxOccurs="unbounded" />
                        <xsd:element name="Relativetheme" type="OpenCmsRelativeTheme" minOccurs="1" maxOccurs="unbounded" />
                <xsd:element name="Contact" type="OpenCmsContact" minOccurs="0" maxOccurs="unbounded" />
                </xsd:sequence>
                <xsd:attribute name="language" type="OpenCmsLocale" use="required" />
        </xsd:complexType>
        <xsd:annotation>
                <xsd:appinfo>
                        <mappings/>
                        <layouts>
                                <layout element="TextField" widget="HtmlWidget" configuration="source" />
                        </layouts>
                        <validationrules/>
                        <defaults/>
                </xsd:appinfo>
        </xsd:annotation>

On random Occasions when opening an index.html of that schema not the HtmlWidget is
used, but the "normal" Html-Input for OpenCmsString elements is used. In Addition the HTML-Content
is shown while having been URLEncoded.

Has anyone expierienced a problem like this or knows how to avoid such a thing?
Where in the Source is it determined which HTML to use when creating the HTML
for editing the content?

Thanks in advance!

Eska