[Tracker] strange behaviour (0.6.3/Ubuntu Gutsy)

[Antonin Chambolle <antonin chambolle free fr>]

Hi everybody
(I just want to complain!!!)
I have been using tracker on Ubuntu Feisty (0.5.???) and now on Gutsy (0.6.3) 
and I think it is not working very well anymore (as it used to). It is hard 
to produce any concrete example but I occasionally notice searches that do 
not produce any results, whereas they should (and used to with the previous 
version)

I have an example, though. I downloaded symbols-a4.pdf from
www.ctan.org/tex-archive/info/symbols/comprehensive/symbols-a4.pdf and saved 
it on my hard disk. Now, when I search "arcminutes" on tracker, it find the 
file symbols-a4.pdf (and no other, since this strange word is unlikely to be 
found anywhere else). But if I ask to look for "atomic" (which is found on p. 
108) then it nevers find this file (it finds many other files). In the past 
month, I tried quite a few other searches that did not help me find the 
correct file, while the word I was searching WAS in the file. I also once 
(and maybe not only once) found a file which was NOT containing the word I 
had searched.

Is it NORMAL ? (it does not seem so, and was not like this with the former 
version, or less, since I hadn't noticed)

If you have any idea why it is so, or if there is some setting I need to 
change, please let me know (I'd rather not switch to google desktop...!!!)
A last question, completely disconnected: is there any chance that postscript 
files .ps/.ps.gz will be indexed some time ? what about archives 
(zip/tgz/tar)?