Hah, thats probably the problem :P
In order to auto-update, a task needs to keep a service open in the background. Most of the time this service will use little if any system resources, only coming into action when it needs to do something, like update a widget. Killing the service means no auto-update.
However, you are safe to kill the gmail app, if you kill this you WILL still get auto notifications of emails. But this doesn't apply to the default mail app, killing that will stop you getting email updates for any email accounts you have set up on it.
If you are using taskiller then yellow does mean it is using resources.
Anyway add the weather (and any other widget you want to auto-update) to your ignore list :P
Let us know if it works out!
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