Error using ==> contourc Input matrix contains no finite values - unable to calculate contours

What does this error message mean??

phandles = contourslice(test,[],[] ... [1:2:10)],n_colorvals);

??? Error using ==> contourc Input matrix contains no finite values - unable to calculate contours

Error in ==> contours at 57 CS=contourc(varargin{numarg_for_call});

Error in ==> contourslice at 199 c=contours(xi(:,:,i),yi(:,:,i),vi(:,:,i), cvals);

test is a 3D matrix (a stack of 2D images) with dimensions on the order of 10x10x10. The weird thing is that the code and the data worked two days ago?

Help very much appreciated!

[Walter Roberson]

Does any(isfinite(test(:))) report true? Does all(isfinite(test(:))) report true?