Have a look in the Current_Stats folder.
There should be some time stamped subfolders.
In each subfolder, there should at least be a Plink log that contains the raw data & if auto-graphing was turned on in the GUI you should see the graphs, one of which will be named Hlog-20140831-1200.png (or something similar).
If you only have the Plink log, try dragging & dropping it onto the GRAPH6.exe icon.
That should generate the graphs & a montage of 2 text lists & 4 graphs.
Which graphs do you have?
It could be that if you have only just started using the programs, the scheduled time to generate the graphs hasn't yet been reached.
You can manually generate the graphs via the GUI at any time by clicking the "Run snapshot graphs" button for the current stats or the "Run GraphPD" button for ongoing stats.
Alternatively, you could generate them by double-clicking the HG612_current_stats.exe or graphpd.exe icons directly in the Scripts folder.