TYPO3 Core

I try to generate a HMENU on entryLevel 4, but no menu will be generated. EntryLevel 3 works fine and the subpages on level 4 are also shown as expected. TYPO3 Version is 4.6.6 but the same behavior appears with version 4.6.0 and 4.6.4.
Webserver is Apache/2.0.63 (CentOS)
I'm looking for a solution since several days and would be very happy about any help!

lib.sortmenu = COA
lib.sortmenu {
10 = HMENU
10 {
wrap = <div id="sortmenu">|</div>
entryLevel = 3
expAll = 1
1 = TMENU
1 {
NO = 1
NO.allWrap = <li>|</li>
alternativeSortingField = title
wrap = <ul>|</ul>
noBlur = 1
}
2 < .1
3 < .1
}
}