I recently transferred a users profile to a new PC. There was an issue with one of the archive .PSTs contained a folder that appeared empty on the new workstation. 

I logged into the old PC and exported the specific folder to it's own .PST and imported it into the new PC.

that worked for about a week. Now when the user adds emails to that folder they no longer show up.

That is a screenshot of the original folder that shows up empty.

The folder I imported has all of the emails except emails added after 7/7/15.

I checked all the rules there are none associated with either folder. 

I've also ran scanpst on all .PSTs involved.

Hi,

From the description, I doubt that there is a custom view or filter set on the folder. To verify this, click to select the folder, and then click View tab > View Settings. In the opened dialog, click Reset Current View button. After that, check if you can see all emails in the folder.

Hope this helps.

Regards,

Steve Fan
TechNet Community Support