This was a solpart menu, it was upgraded to DDR a while back. Now the site was upgraded to DNN 7.1.2 and the sub menus have stopped opening. I have been researching this for a while and have not found any useful information. What should be done to regain the use of the submenus? Thanks!

I don't think so, but maybe. I did not experience it in that order. The skin came with the solpart menu. I used the simple process on the dnngarden.com site to convert it to a ddrmenu.

Here are the directions I followed:
http://www.dnngarden.com/Upgrading-a-...
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Upgrading a SolPart menu
After installing the menu module, edit your skin file using one of the following methods. For old-style SolPart menus:

Replace
<%@ Register TagPrefix="dnn" TagName="..." src="~/Admin/Skins/SolPartMenu.ascx" %>
with
<%@ Register TagPrefix="dnn" TagName="..." src="~/DesktopModules/DDRMenu/SolPartMenu.ascx" %>

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A solution for this issue that has worked for me on more than one site is here:
https://dnnddrmenu.codeplex.com/worki...