Please help, I have some problem.

qq280948982

I am using Mac OS X 10.7.4, and I had downloaded Contract Killer from Chrome Store, everything is work, but some map looks like lost, it cannot display anything, except for enemies, and others is black, what's wrong with it? how can I solve it?

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PS: I had try to clear all browsing data in Chrome, and reload the app again and again, but it still occur this problem.