Alright, I've found some missing entries in the "artifacts.xml":
<artifact classifier='osgi.bundle' id='com.vectrace.MercurialEclipse' version='1.9.1.v201111302231'>
<properties size='1'>
<property name='download.size' value='1669054'/>
</properties>
</artifact>
<artifact classifier='org.eclipse.update.feature' id='mercurialeclipse' version='1.9.1.v201111302231'>
<properties size='1'>
<property name='download.size' value='4840'/>
</properties>
<repositoryProperties size='1'>
<property name='artifact.folder' value='true'/>
</repositoryProperties>
</artifact>
edit: Unfortunately adding these entries doesn't solve the problem. It seems not to help in any way.
[Updated on: Mon, 27 August 2012 09:10] by Moderator