[maplab-users] Bad rendering when drawing a rectangle object on the map

[DECHENE marc]

Hello,
 
I made an application with mapserver 4.2 and it works fine. When i put it on the internet serveur that runs with the 4.4 version, i have a problem when i'm using a tool that draws a rectangle object on the map (query or zoom in ROSA tool). When the borders of the rectangle passes over a white part of the map, the image dosen't refresh so the black borders of the rectangle stay on the map during thr operation.
Is it a common bug? how to solve it?
 
I work with a PNG output file in RGBA mode
 
Any help appreciated.