[Plugin: WordPress.com Stats] WP-Stats only working part time

I’m having a curious problem, hopefully someone can help, thanks in advance.

Using WordPress.com Stats Version 1.6.3 to drive the WordPress.com Popular Posts Version 2.4.2, all is fine during the day, but in the evenings (not sure what time exactly, usually check at around 9p) the stats for top pages seems to stop working. This then leaves a “hole” on my page where the list of top posts should be.

Popular posts will fill out the list if I set it to use 2 days worth of content, but I’d prefer one day.

Can anyone help me understand and/or correct this?

• stats dashboard during the day
• stats dashboard during the evening
• Hole left in the page

http://ww.wp.xz.cn/extend/plugins/stats/