Clicking the HVAC icon on the HomeScreen results in no apps visibly displaying. This behavior is the same on at least RPi3 and Vayu so it seems to be a generic issue. The following log shows the failure:

Dec 28 16:53:03 dra7xx-evm HomeScreen[738]: qml: app is hvac@0.1
Dec 28 16:53:03 dra7xx-evm HomeScreen[738]: launch "hvac@0.1"
Dec 28 16:53:03 dra7xx-evm HomeScreenAppFrameworkBinderAGL[690]: launchApp name: hvac@0.1
Dec 28 16:53:03 dra7xx-evm HomeScreenAppFrameworkBinderAGL[690]: jsonLaunch

{"id":"hvac@0.1", "mode":"local"}

Dec 28 16:53:03 dra7xx-evm afm-user-daemon[678]: NOTICE: binding [/usr/lib/afb/afb-dbus-binding.so] calling registering function afbBindingV1Register [/usr/src/debug/af-binder/1.0-r0/git/src/afb-api-so.c:313]
Dec 28 16:53:03 dra7xx-evm afm-user-daemon[678]: NOTICE: binding /usr/lib/afb/afb-dbus-binding.so loaded with API prefix dbus [/usr/src/debug/af-binder/1.0-r0/git/src/afb-api-so.c:351]
Dec 28 16:53:03 dra7xx-evm afm-user-daemon[678]: NOTICE: binding [/usr/lib/afb/authLogin.so] calling registering function afbBindingV1Register [/usr/src/debug/af-binder/1.0-r0/git/src/afb-api-so.c:313]
Dec 28 16:53:03 dra7xx-evm afm-user-daemon[678]: NOTICE: binding /usr/lib/afb/authLogin.so loaded with API prefix auth [/usr/src/debug/af-binder/1.0-r0/git/src/afb-api-so.c:351]
Dec 28 16:53:03 dra7xx-evm afm-user-daemon[678]: NOTICE: binding [/var/lib/afm/applications/hvac/0.1/lib/libhvac-demo-binding.so] calling registering function afbBindingV1Register [/usr/src/debug/af-binder/1.0-r0/git/src/afb-api-so.c:313]
Dec 28 16:53:03 dra7xx-evm afm-user-daemon[678]: NOTICE: binding /var/lib/afm/applications/hvac/0.1/lib/libhvac-demo-binding.so loaded with API prefix hvac [/usr/src/debug/af-binder/1.0-r0/git/src/afb-api-so.c:351]
Dec 28 16:53:03 dra7xx-evm afm-user-daemon[678]: NOTICE: Waiting port=12360 rootdir=/var/lib/afm/applications/hvac/0.1 [/usr/src/debug/af-binder/1.0-r0/git/src/main.c:553]
Dec 28 16:53:03 dra7xx-evm afm-user-daemon[678]: NOTICE: Browser URL= http:/*localhost:12360 [/usr/src/debug/af-binder/1.0-r0/git/src/main.c:554]
Dec 28 16:53:03 dra7xx-evm afm-user-daemon[678]: ERROR: ioctl failed

{binding hvac} [../../git/binding/hvac-demo-binding.c:125]
Dec 28 16:53:03 dra7xx-evm afm-user-daemon[678]: ERROR: ioctl failed {binding hvac}

[../../git/binding/hvac-demo-binding.c:125]
Dec 28 16:53:03 dra7xx-evm afm-user-daemon[678]: ERROR: ioctl failed

{binding hvac} [../../git/binding/hvac-demo-binding.c:125]
Dec 28 16:53:03 dra7xx-evm afm-user-daemon[678]: ERROR: ioctl failed {binding hvac}

[../../git/binding/hvac-demo-binding.c:125]
Dec 28 16:53:03 dra7xx-evm afm-user-daemon[678]: ERROR: Starting service hvac failed [/usr/src/debug/af-binder/1.0-r0/git/src/afb-api-so.c:252]
Dec 28 16:53:03 dra7xx-evm afm-user-daemon[678]: ERROR: setpgid failed [/usr/src/debug/af-main/1.0-r0/git/src/afm-launch.c:740]
Dec 28 16:53:03 dra7xx-evm HomeScreenAppFrameworkBinderAGL[690]: stateString "not found"
Dec 28 16:53:03 dra7xx-evm HomeScreenAppFrameworkBinderAGL[690]: launchApp pid: -1
Dec 28 16:53:03 dra7xx-evm HomeScreen[738]: pid: -1
Dec 28 16:53:03 dra7xx-evm HomeScreen[738]: qml: app cannot be launched!