[Gvsig_english] Gvsig Bug - Distance measurement tool: periodical function?

[Gilles Delaunay]

Dear users/developers of Gvsig,

I could not find a "submit bug" tracker in the Gvsig community, so I 
assume this list is the right place to discuss a strange "feature" of 
Gvsig which could be a bug.

My problem: the "measure distance tool" of gvsig behaves strangely, it 
is unusable. It goes up and down as I increase the distance I want to 
measure with the mouse.
For example: I click an "origin" point on the map, move a bit: the 
distance shown at the bottom right of the GUI increases quickly. I move 
further: it goes down. I move further: it goes up again, like a 
periodical function. The function also seems to be periodical when I 
change the angle of the distance measured (move the mouse without 
changing the distance to the origin). I could not find any rationality 
in the function: just ups and downs.
The function "measure area" from the GUI has the same problem (I guess 
the "area" function uses the "distance" function). The functions "Area" 
and "Perimeter" of the "Expression calculator" in the Table view have 
the same problem. I assume they use the same (bad) functions.
NavTable shows the RIGHT values. The Buffer function of the SEXTANTE 
plugin works correctly: I assume those plugins use their own (good) 
distance and area functions.

I use Windows 7 Pro 32bit.
I have several versions of gvsig installed on my system, from 1.10 to 
2.0., including CE and OADE. They all have the same problem (with many 
many more problems and bugs for 2.0, but this is another story). I have 
several versions of Java installed on my system: 1.7.0_25 and 1.6.0_26. 
I tested both (disabled one of them in the Java control panel): it did 
not solve the problem. I tested several coordinate systems: it did not 
solve the problem.
I could not find any trace of a similar bug on the internet: am I the 
only one in the world with that problem?

Your suggestions?
Do not hesitate to answer in spanish: I can read it, but my spanish is 
not so good that I can describe a bug "en castellano".

Thanks

Gilles Delaunay
from Berlin