I've installed the wp-polls but although it worked once, now I cannot add/edit any polls - on trying to add a new poll, or edit the default poll, I get a "You do not have sufficient permissions to access this page" message.
I have checked:
 My admin level privileges (this error message is only prompted by edits to THIS plugin).
 Updated WordPress to latest version.
 Uninstalled, deleted files and reinstalled plugin. Twice.
 Logged out, logged in again.
 Cleared browser cache, closed browser, then .
 Tried from different browser where I hadn't logged in before.
 Created new admin level user/login, same problem.
Any help greatly appreciated.