Apparently there is some changes on Skillbuilder Modal Page. I just downloaded it last week and installed it on an APP that has Theme 24 and 26.
The modal Page does NOT Auto Close on these themes.
It works fine on Theme 21.
Then I installed the Modal Page Plugin using a file that I have downloaded long time ago, and it works fine with any theme .....
Make sure these templates use the same DIV ID for the success-notificaiton message. Edit your current page templete, go to notifications section and make sure the DIV ID for the success message is same as what you put in the AutoClose plug-in configuraiton. I also suggest that you change the template of the pop-up window to "pop-up" to remove the "logout" and un-needed header from it