Festival hall bugged

Logged in when event started, did as asked and clicked the festival hall and started 3 chains - all mortars. Then the problems started.. Got this:

https://prnt.sc/u8tr3t

So quest is done but no tick to complete it.

In the following hour I logged off for 15mins twice, cleared cache and flash cache, changed browser, turned a building off/on, hopped to several other islands, did an adventure, turned the 3 chains off/on, added premium, added a pfb, and then when cycle ended I turned all off again and changed to coins turned the chains on again all to no avail, then swapped back to mortars and now get this in Hall (3 chains running)

https://prnt.sc/u8tr3t

but quest now shows none running:

http://prntscr.com/u8uklm

Since then have cleared caches again, logged off/on etc and now banging head on keyboard.

Suggestions?

Finally sorted it by logging off for an hour....

Same thing happened to someone in our Guild, who has just about had enough ......

After getting disconnected at the end of an adv I now cannot get back on with the old 'Green Tick missing' problem.