So I found a MUCH better way of getting around the Overlord crash. You just need to have the Extra Effects Quality turned up to any level (not OFF) before the game launches, then once it is running turn it back down to OFF. You can do this by turning them up before closing the game, or you can have an executable do it for you before you even run it (faster).

If you want to have the executable do it for you (how I do it) follow these steps. Otherwise just remember to turn them up before you exit the game each time.

Step 1: Setting up the preferences - Run the game, set the graphics to however you want them, MAKE SURE the extra effects are turned up!! (NOT OFF) - Apply and Ok out of the settings. Then hit the esc key and click "Exit Game" - don't use Command Q as theres a slight chance that the game won't finish saving the settings in time. this way it will finish saving before the game actually shuts down - Navigate to: ~/Library/Application\ Support/World\ of\ Tanks/Bottles/worldoftanks/drive_c/users/crossover/Application\ Data/Wargaming.net/WorldOfTanks - Copy the preferences.xml file to somewhere "safe", for me I used my desktop

Step 2: Setting up the Executable - Open text edit, create a new document, make it plain text (shift + command + T) - Copy and paste in the following code: rm -rf /Users/YOURUSERNAME/Library/Application\ Support/World\ of\ Tanks/Bottles/worldoftanks/drive_c/users/crossover/Application\ Data/Wargaming.net/WorldOfTanks/preferences.xml

cp -av /Users/YOURUSERNAME/Desktop/preferences.xml /Users/YOURUSERNAME/Library/Application\ Support/World\ of\ Tanks/Bottles/worldoftanks/drive_c/users/crossover/Application\ Data/Wargaming.net/WorldOfTanks

open /Applications/World\ of\ Tanks.app - If you didn't use your desktop as the "safe" spot for your preferences file, you'll need to change the file path from cp -av /Users/YOURUSERNAME/Desktop/preferences.xml. You can just delete the file path (leaving the cp -av part) and click/drag the preferences file from wherever you put it, into that spot. Make sure you drop it EXACTLY in the right spot though. There should be 1 space on each side of it, between the -av and the next big long file path - Change YOURUSERNAME to whatever your username is, then save and close - Make the text file executable by opening terminal, typing "chmod a+x " including the space and dragging in the text file - Right click it, get info, and delete the extension (.txt)

Now you have an executable, that when double clicking it will reset your settings to have a non-off extra effects AND launch the game in one swoop. All you need to do is remember to set the extra effects back to OFF when you get in-game to prevent the crash on Overlord.

Edit: Its possible that some users might not even need to have the extra effects settings turned up on launch. I need it but another user reported that simply launching the game, turning them up, applying, and turning it back down worked for him. Something you might want to try (in a training room) if you want.

Incase your interested I included the old way (much worse way)