W520 with Mini Dock Plus Series 3 won't detect Dell U2412M Monitor

I have a W520 Thinkpad with a Mini Dock Plus Series 3 with USB 3.0.
Until this morning, I was able to use it with my two external monitors connected via DVI to the Mini Dock.
The two monitors I have are:
Acer V243H
Dell U2412M
The Acer works fine regardless of which DVI port I plug it into.
The Dell refuses to work on either port.
Again, both monitors were working fine as of yesterday.
Any ideas on what might have caused this or what I can do to fix it?

I have the same problem with the minidock and display port monitors. It will not recognize them at all on power up. If I then put the w520 to sleep and wake it up a few times, it will then recognize them and allow me to use them as "projectors".
Before I upgraded the BIOS and nVidia drivers, it would always recognize one of the two, and I used to have to pull the cable out and in again on the second. Now this technique doesnt work - sleep wake is the only work around.

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    Excellent, thank you!

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