Multiple Monitors on New Mac Pro

We cannot get more than 3 monitors operational on either of our new MacPro systems.    We have contacted Tech support and they apparently agree... So we're looking for options.
This is what we need:
Monitor 1:    Connected from HDMI port to HP LP2475w computer monitor
Monitor 2:    Connected from Thunderbolt bus 01 using Thunderbolt to DVI port to HP LP2475w computer monitor
Monitor 3:    Connected from Thunderbolt bus 02 using Thunderbolt to SDI (Black magic mini adapter)  to Highend Broadcast color accurate 1080p Monitor
Monitor 4:    Connected from Thunderbolt bus 00 using Thunderbolt to DVI port to WACOM pen tablet
We can successfully connect ANY 3 of the above monitors, up to 3 of them,  in various configurations with success.  If we try to any a 4th monitor, it simply does not work.
We have tried every concievable selection of post configurations with zero success with any thing more than 3 monitors....
HAs ANYONE successfully gotten more than 3 monitors running on a new MacPro and if so how ?
cheers
georgia

Regarding the Bug in 10.9.3:
One of my colleagues (Wjosten) has suggested:
"If you use Internet Recovery to reinstall OS X, it installs the version of OS X that originally came with your computer."
So if this is a deal-breaker, the suggestion is to invoke Recovery_HD and use it to Re-Install [the old version of] Mac OS X over the Internet. Once complete, very selectively search for the individual updates that take you back to the last working version.

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