I am having the same problem.

This appears to be a bug in Qt 4.7.0 (QtSDK-2010.05), as building the qch file with Qt 4.6.3 (QtSDK-2010.04) shows all of the indices appropriately. Until this is fixed, you should be able to build the qch file in Qt 4.6.3 and open it with QtAssistant in Qt 4.7.0 without a problem. I don't see any major problem when I run it that way, but I haven't extensively tested it.