I have loaded several of your plugins and also PHP Compatibility Checker plugin on my site. when I ran this across my site & specified PHP v7, which is what I am using with my site, I got the following errors, which looks like you guys need to fix?
WPMU DEV Dashboard - Warnings: 4 Errors: 1
Upfront - Errors: 12 :
Snapshot - Warnings: 14 Errors: 31
SmartCrawl - Compatible - Warnings: 63
Appointments+ - Warnings: 1 Errors: 4 :
If you access my site (access given) you will be able to see all the errors details, there is too much to include on this message.