iPhoto '11 problem: blank screen in edit mode

If you stumbled on this link looking for a solution to an annoying problem whereby iPhoto '11 seems to be working fine, the database is functioning properly, all photos are in their proper locations, but you can't open them in Edit mode, I hope I can give you one more thing to try. The following solved my problem.

Before rebuilding your database, or following any of the other time-consuming and potentially futile (logical, but useless) strategies given on various threads, do this one thing:

Try using iPhoto on another of your multiple screens, specifically your primary or main screen.

I am using a Macbook Pro, with multiple monitors (three, in fact, none of which are the laptop screen). The first (heretofore referred to as my Main Monitor) is connected via Mini DisplayPort. The other two (Secondary Screens) are connected via USB using adapters with DisplayLink.

When I display iPhoto's main window on one of the secondary screens, the problem occurs (read: I can't see photos I've opened in Edit mode.) When I move the iPhoto window to the main monitor, the problem does not occur, and photos open normally in Edit mode.

The problem likely lies with Quartz, though I know not how. That is where our trip ends.

Please comment if this worked for you.

Update: Sometimes you have to move the window back and forth between your primary monitor and your DisplayLink monitor once for the graphics to "catch". I experienced this the other day: specifically, when I opened iPhoto on my primary monitor, the photos would not open in Edit mode (or, rather, I saw a blank grey screen where the photo ought to have been.) When I moved the window to my secondary screen and back again, the photo appeared normally. Stupid Quartz.

Also, I have found it sometimes takes SEVERAL retries of opening and closing the photo, even when the window is on the correct monitor, for the photo to display. Then, even when it displays, it may not display again the next time you open it and you have to open and close it a few times AGAIN. This is certainly a bug in iPhoto. Poor form, Apple.

Update #2: I am still having this problem, so I apologize for any hope this post may have inspired. Sometimes, the workaround above is ineffective (as reader Paul commented below) and it is impossible to see the photo in Edit mode. Stupid bug.