Re:Calendar Permissions
Serge,
You can see if there is a Bug Report for it on SF site. If so you can attach a note with the solution and close it. You can also submit a patch in the Patch section on the SF site. Lastly, if you would like to participate actively in the development you can request CVS access so that you can apply the patch yourself.
Have a look at the TikiHowToDev for some more info.
Regards,
Pat.
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