Re :Permission denied.
About galleries, are you sure you gave sufficient permissions?
Videos to be sure you do all OK are at TikiMovies. If you can't find, submit a bug report and we'll discuss there or come see if we can solve your problem on IRC.
I guess the same problem applies to polls. Here, the fact that no error message is displayed explaining the permission is missing is confusing. So I reported this to PollDev. Thanks,
You might be interested in reading introductory stuff for TIki, as InstallGettingStarted.