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Of course, it's the same thing that's happening to me.
I've tried exporting the entire Lab, but when I try to access the configured CHRs, it doesn't accept the password, neither the default one (empty) nor the one I set later.
One solution would be to export (/export file=filename) and reload that configuration into a clean CHR, but this is completely absurd and ineffective.
Either we don't know how to use PNETLab's features, or it's useless when using MikroTik devices.