Dear all, Recently I am facing some issues in the post-processing. I use "FieldConvert -m gradient" to get velocity gradient and "FieldConvert -m meanmode" to do spatial averaging in my 3DH1D simulation. They both worked in my previous experiences. However, I found some problem recently. When I am running "-m gradient", I can not convert it to the chk format, but I can convert it directly to vtu format. with chk/fld format, the error shows "Unable to extract the data from the element tag." I am trying to understand it in the source code. But it is still not so clear to me. The other fieldconvert utilities like -vorticity works. When I use "-m meanmode", sometimes it gives me the error "Input data is not the same length as header information". It is also very confusing. Hope someone can help me out here. Merry Christmas and happy new year to all Nektarer. Xu Chu