Hmm. There seems to be a common trait running through this. I'm not 100%, but it may be related to another bug that has been spotted lately. I already have a fix for this, it may just sort out this crash on load some people are getting.
NOT guaranteed though, as you see, one of our testers is having the problem but states he didn't have it all through testing.
Redownload appears to have fixed it. Before I redownloaded I tried every map on local and they all crashed at 5% of loading, even though it worked before, so maybe something corrupted the install.