I just found this thread. We have had many similar reports in the past 24 hours. It doesn't seem to be related to the latest Enhance update. So far the only correlation is that everyone who has reported it is running Openlitespeed on their control panel server and has recently updated to OLS 1.8.3.
If anyone is seeing this issue and is not running OLS 1.8.3 please can you reply here or send a support ticket?