After upgrading my gentoo to Xfree 4.3.0 and glibc 2.3.2_pre1 vmware bails out with 'XIO: fatal IO error 0 (Success) on X server ":0.0"' it seem that our brothers/sisters from vmware.for-linux.experimental already know about this problem. Following the instructions from http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&threadm=m3znptdse7.fsf%40fischman.org&rnum=1&prev=/groups%3Fq%3Dvmware%2BXIO:%2Bglibc%26hl%3Den%26lr%3D%26ie%3DUTF-8%26selm%3Dm3znptdse7.fsf%2540fischman.org%26rnum%3D1 now i can start vmware as root.
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