Problem description: 
In older versions I had no problem in creating comments to nearly all filled in cells in a spreadsheet, (I had version 4.0.something, but it was working in even older versions)
Since I downloaded the new version, the comments are randomly disappearing between a save and reopen (and not even all, but some). This happens if I use the .ods format. If I use an .xls file the problem is, they can't get deleted/modyfied. I delete the comments, do a save, but on reopen they are still (again) there. The .xls problem happens all the time, not just randomly 

Steps to reproduce:
1. I use a pretty random spreadsheet on a daily basis to keep tracking my finances, so it happens in a file with 14 sheets no special formulae used, mainly +-*/
2. Commenting on many cells, doing a save.
3. On reopen they disappear (not every time)

Current behavior:
Described above
Expected behavior:
They don't disappear, or upon delete they should.
              
Operating System: Windows 7
Version: 4.2.0.4 release