Compute shaders : error in the initialization of textures - opengl

Question

I have an image2DArray in my compute shaders with 7 slices.
I can write in it with the function imageStore without problem and also display these textures.
My problem comes with the initialization, I try to initialize my textures but I can't. Indeed, I make a loop for the initialization :
for(int i=0; i<N; i++){
imageStore( outputTexture , ivec3(texel, i), vec4(0));
}
When N = 7, nothing is displayed but when N < 7 everything works well and my textures initialized.
Is someone can explain me why I can't initialize correctly my image2DArray ?
Edit :
What I test to see that : try to write in all slices of the texture and display it. It works fine but data from the previous frame stay if I don't initialize the texture. So, I initialize all pixels of the slices to 0 but nothing display anymore if N=7.
Some code :
#version 430 compatibility
layout(rgba8) coherent uniform image2DArray outputTexture;
...
void main(){
ivec2 texel = ivec2(gl_GlobalInvocationID.xy);
ivec2 outSize = imageSize( outputTexture ).xy;
if( texel.x >= outSize.x || texel.y >= outSize.y )
return;
initializeMeshSet( meshSet );
vec4 pWorld = texelFetch(gBuffer[0],texel,0);
pWorld /= pWorld.w;
vec4 nWorld = texelFetch(gBuffer[1],texel,0);
nWorld /= nWorld.w;
if( length(nWorld.xyz) < 0.1 ){
for(int i=0; i<4; i++){
imageStore( outputTexture , ivec3(texel, i), vec4(0));
}
return;
}
if(nbFrame == 0){
float value = treatment(texel, pWorld, nWorld.xyz, outSize.x);
imageStore( outputTexture, ivec3(texel, 0), vec4(vec3(value),1.0));
imageStore( outputTexture, ivec3(texel, 1), vec4(0.0,0.0,0.0, 1.0));
}
else if(nbFrame == 1){
float value = treatment2(texel, pWorld, nWorld.xyz, outSize.x);
vec3 previousValue = imageLoad(outputTexture, ivec3(texel, 1)).xyz * (nbFrame - 1);
value += previousValue;
value /= nbFrame;
imageStore( outputTexture, ivec3(texel, 1), vec4(vec3(value), 1.0));
}
}