XML code:
<ScriptInfo xmlns="urn:msgplus:scripts" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="urn:msgplus:scripts PlusScripts.xsd">
<Information>
<Name>Facebook Status</Name>
<Description>Sets your Personal Message to your Facebook status</Description>
<Version>1.21</Version>
<UpdateId>FBPSM</UpdateId>
<BuildNumber>121</BuildNumber>
</Information>
</ScriptInfo>
Plus! seems to be sending the <Version> when auto-updating, while <BuildNumber> should be send. Just tried: If I lower the <BuildNumber> there is no updatenotification, but if I change <Version> to anything there is. Your XML looks correct to me.
Patchou?