Double display of search topics

[Softweaver]

Hello,

We are using Adobe RoboHelp 11. After compiling the HTML files to *.chm format, topics are listed twice (tab search). If one of the both topis contains German umlauts, they are interpreted false. See attached image:

Is there a possibility to clean or build new the search index?

Thank you!

J. Kammerer

Softweaver GmbH