Hello,
A couple of computers are able to open a pmf file but the file geodatabase features are not viewable. Shapefiles and online data show up fine.
When I looked at the data source I noticed that the Data Type shows up as "Unknown" but when looking at the same ArcReader pmf on my computer I see that the Data Type is File Geodatabase Feature Class. See below.
We have tried uninstalling and reinstalling ArcReader on the person's computer and it still would not read the filegeodatabase. The data is local to the machine as well as the pmf file.
Any suggestions?
Amy
problem computer: 
my computer: