Hi,
I gave it a quick try myself, and it seems to be working fine for me. Maybe they are not locked by a layer or Element Level, but part of a Hotlink or something (that stops them from being editable on their own)? Try breaking all Hotlinks and suspend grouping, and see if that helps.
If not, please send me the file (in PLA format, in a private message), so that I can take a quick look.
Regards,
Daniel Alexander Kovacs
Professional Services Consultant
GRAPHISOFT
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