From MOS (Metalink) a search for “Patch Set – List of Bug Fixes by Problem” is a useful search, andother is “Availability and Known Issues”. Whenever you find some behaviour that looks like a bug, it’s worth checking the patch sets for the patches or release that are newer than the version that you’re running – you may find that your problem is a known bug with a patch that might be back-ported.
For ease of reference, here are some of the results I got (sorted in reverse order of version) from the searches; you will need a MOS account to follow the links:
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17 weeks 4 days ago
27 weeks 2 days ago
29 weeks 18 hours ago
32 weeks 2 days ago
34 weeks 4 days ago
44 weeks 19 hours ago
45 weeks 4 days ago
46 weeks 4 days ago
46 weeks 5 days ago
49 weeks 3 days ago