Will it cause problems if I use components from different series?
Your best performance will come from using components which were designed to work together, i.e. with the complete drive train from the same year and series. That doesn't mean that different combinations will not work together at all, however.

While I have occasionally used a 9 speed front derailleur with a 10 speed drivetrain as an emergency fix, it shouldn't be used for a permanent set up. Your shifting performance will suffer, even if they are both double or both triple components. 

In addition, the year and model of the Dura Ace components matters. The 7900 STI levers, which are current Dura Ace, have compatibility issues with the 7800 front derailleur of just 2 years ago, even though Shimano says they are fully compatible.

I've added scans of the Shimano 2012 Compatibility charts for front and rear drive train components. You will notice that no 9 speed part is listed as compatible with any 10 speed part, but that even the new 4600 Tiagra 10-speed is listed as compatible with all 10 speed components.

I hope that helps.

Shimano Front Derailleur Compatibility Chart


Shimano Rear Derailleur Compatibility Chart