This is a maintenance release. The following items were fixed and/or added:
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VMM: emulation fix for the ENTER instruction under certain conditions; fixes Solaris 10 guests (VT-x without unrestricted guest execution)
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VMM: fix for handling NMIs on Linux hosts with X2APIC enabled
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NAT/NAT Network: fix connection drops when the host's DHCP lease was renewed (4.3.22 regression; Windows hosts only; bug #13839)
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NAT: don't crash on an empty domain list when switching the DNS host configuration (4.3.22 regression; Mac OS X hosts only; bug #13874)
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PXE: re-enable it on Windows hosts (4.3.22 regression; Windows hosts only; bug #13842)
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Shared Folders: fixed a problem with Windows guests (4.3.22 regression; bug #13786)
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Audio: improved record quality when using the DirectSound audio backend
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VBoxManage: when executing the controlvm command take care that the corresponding VM runtime changes are saved permanently (bug #13892)
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Windows Installer: properly install the 32-bit version of VBoxRes.dll on 32-bit hosts (bug #13876)
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Linux hosts / guests: Linux 4.0 fixes (bug #13835)
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OS/2 Additions: fixed mouse integration (4.3.22 regression; bug #13825)