Javadoc suggestion module problems

Hi,
I'm having problems using the Javadoc suggestion tasklist. I've 
installed it through the update center.
Only every now and then when I click the Suggestions icon in the 
toolbar, it will come up with suggestions in the lower window, but in 
most situations, it will only show a suggestions window without 
suggestions, while there is plenty to suggest ;)

Also, in the few situations where I got some suggestions, the Show 
Source button did not work. I expect it to automatically scroll the 
source to the designated location, but nothing happens.

Can you give me some advice?
Thanks,

Tom