But now I seem to have located the cause of the trouble, which is "Birthdays & Anniversaries" calendar in Evolution. This calendar somehow stopped working after enabling Compiz Fusion (yes, I know they are hardly connected, but it worked in the morning, and all I did on my computer since that was enable Compiz), and the Clock applet was trying to show the data from that calendar and hanged half the system every time I clicked it.
After unchecking the problematic calendar in Evolution (which was real pain to do, since Evo tends to hang each time I ever click somewhere near that calendar) Clock applet works seamlessly again.
amd64
But now I seem to have located the cause of the trouble, which is "Birthdays & Anniversaries" calendar in Evolution. This calendar somehow stopped working after enabling Compiz Fusion (yes, I know they are hardly connected, but it worked in the morning, and all I did on my computer since that was enable Compiz), and the Clock applet was trying to show the data from that calendar and hanged half the system every time I clicked it.
After unchecking the problematic calendar in Evolution (which was real pain to do, since Evo tends to hang each time I ever click somewhere near that calendar) Clock applet works seamlessly again.