Same problem for me. Playing full tables on Full Tilt. I did notice that going the the HUD Configuration screen and clicking the Apply button restores the missing stats.
I think I discovered a short term fix. When it happens, it seems that if I go to Configure Statistics>>>Hud Options and deselect the only DB I have listed under "Read from Databases" and click Apply the problem fixes itself. But if I then close this screen Immediately return to it, the database is again selected and the problem begins to slowly and apparently randomly return.