Problem with webots

Hi !

1)-----------------------
I am trying to use linux rpm version of webots.
Got no problem with webots-4.0.12-1.i386.rpm

But the webots-4.0.16-1.i386.rpm doesn't work
anymore on my linux pc (mandrake 9.1).

I got this error :
Gdk-ERROR **: BadPixmap (invalid Pixmap parameter)
  serial 21912 error_code 4 request_code 54 minor_code 0

2)-----------------------
So, I use 4.0.12 linux version.
I have not found any changelog tracing all bugfixes
and change in webots. The knownbug.html file of the 4.0.16
tar.bz archive seems outdated. Got no way to know
what is a known bug, what is a corrected bug, and what
is a new bug that must be reported.
It's a bit boring as I am more interested in coding for the
contest than in reporting already known webots bugs...
So, if someone can point me to one up to date
webots changelog, he will be in my xmas kiss list ;)

3)-----------------------
I don't succeed to move my arm the way I requested it.
(remember I am using linux 4.0.12 webots version).

It seems that the reached position can't be farther than actual 
"position +/- 3.14".
So, if my arm is at position 0, I succesfully ask it to reach
position 2 (in radian). But if after that, if I ask it to reach 
position -2, instead of reaching this position through the 0 
position, it reach it the shorter way, through the 3.14 radian 
position...

Is this a known bug ?
Is this corrected in version 4.0.16 ?
How can I succeed to use 4.0.16 on linux
whithout gdk-ERROR ?

There is also a bug with the get_position fonction which always give a 
positive value. But it seems to be a known bug. Don't know if this is 
supposed to be corrected in 4.0.16.

I also got some problem if the requested position is a float NaN 
number.
Joint continusly turns with no way to stop...


4)-----------------------
I have not understood the "robot_step()" function :
- what happen during contest if I put robot_step(1) instead of a 
greater value ?
- how does the webots simulator behave if I am falling, and if I take 
5 seconds to compute the joint requested position for the next step, 
and only put a robot_step(1) in my code ? Will my body continue to 
fall during my 5s "reflexion" or is the time suspended ?
- if the contest computer is faster than my, it will performs 
computation faster and my behaviour will probably be different...
or not ? I have probably not understood the real time check box 
option...


That's all folks !

Bothari, maybe entering contest the 1st of december...




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