I've created a sample project demonstrating this issue:
Another important note is that it only occurs in IE7. It works fine in Firefox. I'm using Vista Ultimate.
Again to replicate here are the steps:
1 - Click the option button to load user control
2 - Scroll all the way down to the bottom of the page as far as you can go.
3 - Now click the next button on the grid navigation.
4 - Notice that the page become taller and the browser scrollbar now shows the page has gotten taller as well.
5 - Now scroll the page as far as you can to reach the new page bottom.
6 - Start paging again and notice that the grid jumps. It doesn't do it everytime in this sample project, but it does in my main one. But if you page forward and backward 10 times or so you will notice the whole page shifts up and immediatley back down again randomly. I've tried paging both slow and fast. It happens randomly in both cases or on every page change in my main project as I stated before.
Any help would be greatly appreciated as I really want to use a slider control in my pager template.