i had exactly the same problem.
but now i found the solution. i have the gtx970 and since i installed a new driver ( since then because of the battlefront beta ) after the new driver I needed for newer games, it was impossible to work on my maps. constantly and seemingly random freezes with the Worldbuilder.
most frequently if i moved objects and splines at the map edge. not possible to work longer as 2 - 3 mins on a map befor the WB freezes
now i reinstall my old driver from aug. 2015 and it runs again perfectly and without problems.
if i install back to a newer driver after aug. 2015, i immediately have again the described problems.
sorry, my english grammer is not good.
i hope relic fix that. with older driver i cant play battlefront & co but with current driver i cant build on maps in coh2.
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#Steam AliasWL%Streak
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