Main display blank after sleep under Mavericks

I use a NEC Multisync LCD 2690 as my main display, and a small Hansol H550 as a secondary one; when waking up from sleep, the NEC is blank and everything is crammed up on the Hansol. Under Lion, I could go to the System Preferences, choose Monitors and Detect Monitors to force the displays to correct themselves but this feature is absent under Mavericks; any idea how I could correct this without having to perform a complete restart each time the Mac Pro goes to sleep?

Found the so-called missing feature: in System Preferences, choose Monitors and hold down the Option key to get the Dectect Monitors button. Still, loosing the main display after sleep is a BIG bug...
P.S. I’m working with a French system, the naming of the features might be slightly off.

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