After manually update from 0.6.0 to 0.6.1 some graphs (pie chart, bar chart, …) are not shown.
Flash (Adobe, version 10.0.45.2) is installed and works.
It is no Browser problem (I tested it in different browsers).
No, there was no such warning. However, I run the updates always manually (I think since a 0.4.x version of Piwik) because the automatic update ran no longer (access problems ???).
For the upload I use as an FTP Client ‘WS_FTP Pro’ in the automatic upload mode. Until the last 0.5 version of Piwik, there were no problems.
At the update to Piwik 0.6 png graphics were not transferred correctly and at the last update to version 0.6.1 I had the above problem.
I’m sorry that I have no more information for you.