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In case your server has been installed RVskin
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Please update RVSkin by going to WHM -> RVGlobalsoft Manager -> RVskin Manager -> Update. After that, please check the icon of RVsitebuilder again. In case icon of RVsitebuilder still doesn’t display, please run as following commands:

rm -f /usr/local/cpanel/Cpanel/rvversion
perl /root/rvadmin/auto_rvskin.pl

Then check the icon again.
If you still cannot see icon showing, please submit support ticket with your login information to SSH and WHM on your server.

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In case your server has not been installed RVskin
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Please SSH to the server as root and run following command.

rm -f /var/cpanel/rvglobalsoft/rvsitebuilder/var/INSTALL_COMPLETE.php
rm -f /var/cpanel/rvglobalsoft/rvsitebuilder/rvsitebuilderversion.txt
perl /usr/local/cpanel/whostmgr/docroot/cgi/rvsitebuilderinstaller/autoinstaller.cgi

Then check the icon again.
If you still cannot see icon showing, please submit support ticket  with your login information to SSH and WHM on your server.