I have the same issue with one user/reseller that is getting a blank page after updating the CWP.
tail /usr/local/cwpsrv/logs/error_log
Here it is the log:
PHP message: PHP Warning: fclose() expects parameter 1 to be resource, boolean given in /usr/local/cwpsrv/var/services/user_files/modules/cwp_framework/traits/DashboardExtraVarsTrait.php on line 0
PHP message: PHP Fatal error: Uncaught Twig_Error_Loader: Unable to find template "index.html" (looked into: /usr/local/cwpsrv/var/services/users/cwp_theme). in /usr/local/cwpsrv/var/services/twig/lib/Twig/Loader/Filesystem.php:226
Stack trace:
#0 /usr/local/cwpsrv/var/services/twig/lib/Twig/Loader/Filesystem.php(143): Twig_Loader_Filesystem->findTemplate('index.html')
#1 /usr/local/cwpsrv/var/services/twig/lib/Twig/Environment.php(269): Twig_Loader_Filesystem->getCacheKey('index.html')
#2 /usr/local/cwpsrv/var/services/twig/lib/Twig/Environment.php(345): Twig_Environment->getTemplateClass('index.html')
#3 /usr/local/cwpsrv/var/services/twig/lib/Twig/Environment.php(288): Twig_Environment->loadTemplate('index.html')
#4 /usr/local/cwpsrv/var/services/users/index.php(0): Twig_Environment->render('index.html', Array)
#5 {main}
thrown in /usr/local/cwpsrv/var/services/twig/lib/Twig/Loader/Filesystem.php on line 226" while reading response header from upstream, client: 22.19.1.24, server: localhost, request: "GET /cwp_592060a44456f1b6/albert/ HTTP/1.1", upstream: "fastcgi://unix:/usr/local/cwp/php71/var/sockets/raduale.sock:", host
[root@hosting albert]#
Dear Support Team, please look into this issue as there are almost 2000 views for this issue and nobody responded yet.
I'm looking forward to your answer.
Best wishes.