New ver. of VSTO Word addin yields certificate error

Hello !
I have developed a little Word 2010 extension using VSTO.

The issue is that a new build where I have only changed a few lines of code, installation on a computer yields a certificate error.

Computer A is a Windows 7, office 2010, a lot of other programs.
Computer B is my testmachine with only windows 7, office 2010.

On Computer A I have installed version 0.9.1 - Here the user get prompted that the publisher can not be verified and he can choose to install anyways. Addin works


On Computer A I try and upgrade to version 0.9.2 - Now the installer says it can't be done since the publisher is not trusted.

On Computer B I have installed version 0.9.1 - Here the user get prompted that the publisher can not be verified and he can choose to install anyways. Addin works

On Computer B I try and upgrade to version 0.9.2 - Here the user is prompted again about the not trusted publisher. Here in upgrades fine, and the new version works

Any Idea why it's different on Computer A. I have gone over the trust center setting, and can't seem to see any issues.

Any input is greatly aprciated :)

Best Regards
Soren

Tags: Microsoft Office, Visual Studio 2010, Errors, ClickOnce, Certificate