two error messages after reinstalling the plugin:
WassUp 1.9: WassUp cannot generate accurate statistics with page caching enabled. If your cache plugin stores whole WordPress pages/posts as static HTML, then WassUp won't run properly. Please deactivate your cache plugin and remove "WP_CACHE" from "wp_config.php" or switch to a different statistics plugin.
The plugin generated 177 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.
The plugin is however active, and has recently recorded 2 bots, but nothing else.
Options: shell_exec disabled, 40M memory, WordPress Cache: on
