Dear WPMUDev support,
While opened my sub-domain dashboard (user admin) then click to pro-sites --> Select premium plugin, then click preview the theme that I want to change, preview show the current theme instead of my expected theme. But the theme succeeded changed while activated. Then I deleted the custom domain in domain mapping setting then it works. So the preview themes problem while the custom domain added to domain mapping.
Searching to this forum and found similar case @ https://premium.wpmudev.org/forums/topic/theme-preview-error but I didn't see the solution. Please advice.
I am using WP 3.3.1, domain mapping 3.0.7. Cheers.