When clicking on “Show/hide places panel” the message “You are using a browser that is not supported by the Google Maps JavaScript
API. Consider changing your browser” appears and Picasa shows nothing in corresponding panel.
The following change to the registry will enable
IE 11 backward compatibility mode:
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION]
"picasa3.exe"=dword:00002af8
After Picasa is restarted the panel should work.