BUT I think a new bug creeped in. This is Tuesday night, September 27th and WWL shows forecasts starting from Thursday. What happened to Wednesday day and night?! Hovering over the Thursday forecast shows that WWL "thinks" that Thursday is the 28th while it is the 29th in reality.

See the screenshot

If it's still displaying incorrectly, please email me a registry export so I can check out your data.

I wasn't able to reproduce that issue, but I did find something in the code that I think might be causing that issue. Here's a new Weather Watcher Live build:

http://www.box.net/shared/bbfy53n91ztl351323rn

No change. WWL states that the most recent forecast has been downloaded on the 28th (correct) but it still thinks this is Thursday (incorrect). Please have a look at the screenshot from "daily" showing the incorrect dates for Thursday and Friday and another screenshot showing the correct date on my computer.

Thanks for the registry export and screenshots. I saw that the day names were incorrect in your registry data, but I wasn't able to reproduce the problem on my computer. I tweaked a few things in that area of the code and have a new build for you to try.

http://www.box.net/shared/e6c4qgareai9eb7xnx66

I'm assuming you're already doing this, but make sure you click "UPDATE" to retrieve the weather after installing the new build. I just want to make sure you're not seeing data that was downloaded by the previous build.

If this new build does not fix the problem, then please send me a new registry export

Well, Wednesday is back, but the days are out of order - similar to the first problem in this thread. The difference is: at the beginning it was like Saturday day, Friday night, Sunday day, Saturday night. Now it is like Saturday day, Sunday night, Sunday day, Monday night (see screenshot). I will send the requested registry export.

Here is a new build:
http://www.box.net/shared/zfnib332yi2hga0bq5f3

I think I figured it out. In the "Region and Language" section of the Windows Control Panel, you'll find a setting to set the "First day of the week". For most locations, I think the default is Sunday. I was able to reproduce results like yours by changing that setting to Monday.

Looks fine at the moment. Indeed Monday was the first day of the week on my computer (which is probably the dominant "view" in most European countries).