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the initial release have most bugs, so synopsys have to release some service pack release -SP1, -SP2, or more. so try to install the latest service pack release rather than latest initial release, for example, if ver 2001.08-SP2-2 released, at the same time, ver 2002.05 also released, use the 2001.08-SP2-2 release, it's more stable.
BTW, synopsys synthesis tools is realy buggy proggie, but nobody complains it, because it's the only choice.