I have installed the vacation plugin & activated it. Have set both vacation mode & disabled purchases. Set the start date to today & finish date to Jan 15. Added message & saved changes.
Went back to my site & there is no message & the shop is still working.
All of a sudden 3 hours later, I've got the holiday message in my Online Store & the Shop is disabled. Contact Buttons not working but at least the store's on Vacation now.
Do you have any caching plugins installed?
Given the lack of activity, I'm going to close this issue for now. If you have any further questions, feel free to create a new one.