I added a user to my Pwiki account from Sourceforge project - that worked OK - but get this error when trying to change permissions for this user - or anonymous user:
Webpage error details
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; OfficeLiveConnector.1.5; OfficeLivePatch.1.3; .NET4.0C; BRI/1; BRI/2)
Timestamp: Fri, 6 May 2011 15:53:43 UTC
Message: Expected ';'
Message: Object doesn't support this property or method
Worksforme with Piwik 1.4. If this is a SF Hosted App, then you'll have to ask them to update.