I am running 2 machines with Boinc version 5.4.9, using the same account, same projects.

I thought that when I looked at the Statistics screen, "Show User Average", it was supposed to show the average for both my PC's.

Yet when I look at the two of them, I can see a huge difference in the graphs of data. It gives me the inpression that they are tracking individually rather than as a team.

Is there some setting I have fouled up, or is this normal?

Boinc stores each project's credit and RAC when it communicates with servers. This probably happens independently on your two machines, possibly on different days. The larger your caches are and the more projects you are attached to (4?), the more the graphs can differ...

If you manually update any project on both machines, it's most recent values should be the same.

The statistics should look (at least) very similar if the communication times were the same. Give it a try and, for a few days, at the evening (local or UTC time? probably local), manually update all projects on both of your machines. You should see it then.

Peter