I have tried to programatically space report elements farther apart vertically just before issuing REPORT FORM TO FILE ASCII, including increasing band size, but sometimes a line is totally skipped and some others a field and a label are printed in separate lines. The difficulty could be dealt if I knew exactly the rules used by VFP to determines break between lines. Does anyone have any idea what those rules may be?

You have to screw around with the values of _ASCIIROWS and _ASCIICOLS before you issue the REPORT form. What values? Depends on the report and whether it is in portrait or landscape mode.

Check out these 2 system variables in the on-line help.