System Mac OS 10.11.6. After upgrade to LibreOffice 5.4.2.2 the table function for SUM in Writer only gives “0” result. Document is saved in odf format and if opened in OpenOffice, application of the SUM function yields the correct nonzero value. What has happened with 5.4.2.2?
Please provide a test document. Brief testing (A1=1; A2=2; A3==SUM(<A1:A2>)=3) using 5.4.2.2 on Windows doesn’t show a problem. It might be something with formulas, with source data, or be Mac-specific.
Also, you don’t specify from which version did you upgrade? So, which version (aside from OpenOffice - again, it’s unclear which OpenOffice do you mean) worked OK?