I've had a problem between appointments+ and UpdraftPlus. UpdraftPlus have found a solution but have asked me to pass this info along to appointments+ support, see quoted message below.
"As suspected, this plugin unconditionally loads an old version of Google's SDK on every page load - which causes it to conflict with any other plugin that wants to use Google's SDK.
Please can you contact their support, and point them to this link - and explain that their plugin has the exact same issue: http://wordpress.org/support/topic/dont-unconditionally-load-old-google-sdk?replies=2
I've also added a work-around to the current release of UpdraftPlus; if you de-install and then re-install, the you should be fine (the version will remain 1.9.5)."