[SOGo] Cannot select then unselect in web calendar

[Donny Brooks]

Ever since we upgraded to 1.3.15 a week ago I have had users complain 
about some problems in calendar of the web interface. I have been able 
to reproduce the issue consistently. If you open your calendar, uncheck 
any of the checked calendars it will go away like it should. However if 
you try to recheck it you cannot. Same in reverse. Plus the checkmark 
never goes away. You have to reload the webpage to get it to work again. 
I have tried multiple browsers and os's. I have cleared the cache and 
everything I can think of on the client pc's all to no avail. Does 
anyone have pointers on what to check?

Donny B.
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