Welcome to Mint lillumultipass
Loss of window borders, including the x in the upper right corner, is a common, well known problem with a misconfigured beryl
In here you should find the solution:
http://www.linuxmint.com/forum/viewtopic.php?t=1036
The guide talks mostly of ATI and nvidia but you should find what you need.
There's a similar guide in the wiki:
http://www.linuxmint.com/wiki/index.php ... Linux_Mint
Problem with Beryl since Compiz install
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Before you post read how to get help. Topics in this forum are automatically closed 6 months after creation.