I’ve already asked this question but got no answer - just a comment from a fellow sufferer of the mysterious vanishing comments in calc bug. I’ve also seen it reported several times elsewhere, but again, no answers. Cell comments will just randomly vanish from Calc. No warning, no errors, just open up your spreadsheet and some, or all of your comments, will be gone. Perhaps someone can point me to how best to file a bug report on this ?. Have used Windows and Excel for years but have been trying to make the switch to Linux so as to avoid Windows 10. I thought that LO Calc was up to the job, but this is a deal breaker for me. Going back to MS Excel until this can be fixed 
LO 4.4.6.3 on Arch Linux.
