Now it works again. The output of %MOSTONLINE_DATE%
shows the correct time. But the counter restarts with zero and your old most users online are deleted.
Try this:
1. Deactivate the plugin on the plugin page .../wp-admin/plugins.php
2. Delete it there, too (with all data)
3. Download and unzip the 2.73-beta version
4. Upload it on your ftp-server (in the plugin folder, of course)
5. Activate the plugin on the plugin page .../wp-admin/plugins.php
6. Check the options and save the widget if using
For example now it shows:
11, on 11.05.2010 @ 03:53:19
(see it on my site)