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all my layout port "labels" are missing, . Any clue? thank[/quote]
If your labels are using a symbolic cell, you will miss label information. Even in your same Cadence software(VirtuosoXL) when you streamOut and streamIn again. So, my suggestion is: Don't export database until you tapeout.
Um, just as a neurotic sidebar: I heard that cadence embeds a code into their gds files that when a foundry "sees" contacts cadence to determine that the person that sent it in is registered.
This is no problem if you actually bought the software...however, if you haven't, it seems that it could present some problems. Legally, financially, ninja in the nighty.