I’m running version 9.15. I use TortoiseHg for version control and the icon overlays work fine in the explorer plugin. However when you click on a tool in the context menu (such as visual diff or commit) the dialogue windows don’t popup. They do in windows explorer.
I have not tried TortoiseHg, but I don’t expect all tools and popup windows work correct on the Explorer plug-in. If they don’t work, please try to use your tools on Windows Explorer.
However, I will try to reproduce the issue and see if I can fix it.