We recently identified a problem that resulted when we had two separate jar files for MySQL loaded with our base software configuration. The base configuration has been corrected, but it's possible you could run into this problem on existing sites.
The problem only occurred while logging into a system using the Registration Sign In dashboard or while confirming a registration using the Registration Confirmation dashboard. Both dashboards log the user into the site.
The error was a low level error issued from MySQL that is almost impossible to understand and could not be debugged on a system that was configured correctly since this error would then not occur.
To fix the problem, you can not simply run ./synch8lib.sh axx against your software instance. This synchronization script will delete the jars in shared/lib and then reload them from catalina-base which is now correct.
The error details are listed below
AgPersistorFactorySqlDom.findDOM failed - GizmoDelivery failed[ A1xbcx1x83y1xbfx1x80y1x505x1x68y1x88ex1x66y1x10a3x1x68y1x10a5x1x97y1x10adx1x6cy1x10bax1x96y1x10bbx1x96 ]:0:S1C00 / com.mysql.jdbc.NotImplemented: Feature not implemented
The key here is that "Feature not implemented" is not our error but it comes out of the jdbc driver itself. And a google of "S1C00" gets you some indication that you have asked the driver to do something it cannot do.