Are you exporting and importing compressed partitions?

Your luck just ran out.
Oracle imp utility uses convention inserts exclusively and partitions will lose compression after import as the inserts are not direct-path. The shiny 10g datapump has the same limitation. You will have to recompress the partitions later, like
1. Insert(append) into an empty table from the uncompressed partition.
2. Partition exchange
3. Truncate the table.
Then repeat for every uncompressed partition.

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