the version is 4.0.0.3, but ironically there is a bug in the bug reporting system.

Problem description: 
I use the check box control on a spreadsheet, but with the new version, depending on where I click on my spreadsheet several of the check box controls (5 to 10 at a time) will disappear. All that disappear are close to each other, meaning above and below the disappearing section will not disappear. 

I tried deleting and re-adding the control but that didn't help.

If I click around enough the controls will reappear, only to disappear after a few more clicks.  

Steps to reproduce:
1. have a spreadsheet with data
2. add a check box control
3. click nearby sections of spreadsheet

Current behavior:
the check box controls disappear and reappear

Expected behavior:
the controls should never disappear (unless deleted of course)
              
Operating System: Windows 7
Version: 4.0.0.2 rc
Last worked in: 3.6.5.2 release