Reboot is not the issue. He is doing/not doing something but not saying what. Probably not selecting which plugins to install.
I have just re-installed a 7.3 image and did the clean option to start from scratch and confirm no issue at all.
Menu > Plugins > Green (download plugins)
Select Skin packages
Press OK to expand the list
Scroll down to the Kidac skins
Select the ones you want. Press OK on them so that the they have a download indicator next to the them
Once you have selected the packages you want, press Green to install them.
After installation,
Menu > Setup > Usage & GUI > Skin Settings > A list of installed skins is shown
Select/Highlight the one you want to activate > press OK
Say yes to the restart option
See here for pictures guide:
Thread
Install Kiddac skins from OpenATV plugin server
To install Kiddac's skins or any other skin from the image's plugin server, follow the instructions
Menu > Plugins > Green (download plugins)
Select Skin packages
Press OK to expand the list
Scroll down to the Kidac skins
Select the ones you want. Press OK on them so that the they have a download indicator next to the them
Once you have selected the packages you want, press Green to install them.
linuxsat-support.com/cms/attachment/240126/
linuxsat-support.com/cms/attachment/240127/
…
Menu > Plugins > Green (download plugins)
Select Skin packages
Press OK to expand the list
Scroll down to the Kidac skins
Select the ones you want. Press OK on them so that the they have a download indicator next to the them
Once you have selected the packages you want, press Green to install them.
linuxsat-support.com/cms/attachment/240126/
linuxsat-support.com/cms/attachment/240127/
…