Thunderbolt to VGA Adapter not working with SMART board all of a sudden?

I was wondering if anyone had any suggestions on getting my classroom's (I'm student teaching) SMART board connected to my macbook pro (13 in). Two days ago I tested the setup I had, Mini-DVI to VGA adapter, Mac OS X SMART software suite and it worked flawlessly. Today I try the setup and although the SMART board recognizes my macbook via usb, the projector does not display anything. System preferences does not even recognize the projector as an external monitor. When I plug in my Mini-DVI to VGA adapter (already attached to the VGA cord from the SB) the screen flashes black and goes back to normal. Official work from SMART technologies is there is no supported adapters for connecting a macbook to a SB but I have seen numerous threads about this setup working and like I said it was previously working fine. Any suggestions on what to try next? I was thinking of dual booting to an older version of OS X. Thanks.
Specs:
MacBook Pro 13 in
2.4 GHz Intel Core 2 Duo
4 GB 1067 MHz DDR3
10.9.1

If your laptop is not connected to power (i.e., plugged in to a wall), try plugging it in. It is not uncommon for a laptop to send the VGA signal out with less power when it is on battery power. I've seen this fix this problem, at least, dozens of times.
Try connecting the VGA cable to your adapter while the smart board display is on THEN plug the adapter in to your computer.
Also, try connecting the VGA+Adapter to your mac before booting it (or connect the macbook to the vga cable and then reboot the macbook). I've seen this work with macbooks using vga on projectors (or other external displays running through longer cables or crestron/extron/whatever switching equipment) many many times too.
If these fail, get your campus AV (or IT) people involved. We have often found that a damaged cable or long run needing amplification will work with some computers but not with others. It could be that the cable running from the smart board is somewhat sketchy.
Also, have you attempted to connect your macbook to any other display since starting to have the issue? A bad dongle (dp to vga adapter) isn't rare. I have a bad one sitting on my desk at this very moment.
One last thing you can try, this works for some:
Shut of the mac
Connect it to the smart board (i.e, connect the cables)
Turn on the mac and then close the lid
This *may* boot the computer on the external dispaly (smart board)
Open the lid before it comes to the login screen.
Hopefully one of these suggestions helps.

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Thunderbolt to VGA Adapter not working with SMART board all of a sudden?

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