Dolphin shows for example the "recently accessed"-folders if nepomuk is available. It does not if dolphin is started before nepomuk (or so it seems) at login. This is a serious problem at least on my desktop because it makes the session-manager which starts dolphin at login useless. (dolphin starts but apparently nepomuk is not ready at this point and dolphin is without nepomuk-features). It always happens that I have to restart dolphin to obtain the nepomuk features. Maybe a frequent check on nepomuk-availability would at least partially solve the problem. Reproducible: Always using kde 4.10.3
Thanks for the bug report. This will be fixed in KDE 4.10.4 (which should be released today according to the release schedule). *** This bug has been marked as a duplicate of bug 304918 ***