This seems to be an issue with css not getting picked.
Follow the below steps to truncate the cache table.
1. Take Database Backup
2. Shutdown the nodes affected by this issue.
3. Truncate "pr_sysgen_static_content" table which contains the assembled CSS files
4. Clear the Pega Temp Directory, one which has the generated java,classes and static content files.
5. Start the nodes.
6. Clear the browser caches and verify logging into designer studio.
Reference : SA-23519.
Posted: 5 years ago
Posted: 23 Jan 2017 4:27 EST
Mounika Thatikonda (MounikaThatikonda)
Senior Technical Solutions Engineer
This is very likely caused by the "pzDeleteOprhanStaticContent" agent incorrectly deleting the CSS files. While following the steps Mounika posted will resolve this temporarily, this may re-occur. If it does, there is likely a hotfix for this, depending on your version of Pega 7.