I use a couple of self-made .qch help files. They worked fine in all previous Qt Creator versions. I tried Qt Creator 2.0-beta and I can't locate topics in those external files from the locator popup anymore, despite the fact that those help files are installed, registered and are perfectly searchable from within the Help system. The screenshot illustrates this: while I can find 'HBufC' in the Help's Index pane, it is absent in the locator popup.

I can provide .qch files by request, but I doubt they are the problem – they seem to work fine.