This is a simple fix for the issue with PhpMyAdmin where exclamation mark shows on all databases.
Problem is related to browser caching, not to PhpMyAdmin itself.
To fix this issue in your browser follow these steps:
Click Tools from the Internet Explorer menubar
Click Internet Options
Click the General tab
Click the Delete Files button in the Temporary Internet files section
If you still have a problem, repeat the steps above and restart the computer.
Click Edit from the Firefox menubar
Click Preferences from the Edit menu
Expand the Advanced menu by clicking the plus sign
Click the Clear Cache button
Click Edit from the Ope ra menubar
Click Preferences from the File menu
Click the History and Cache menu
Click ok to close the Preferences menu