Custom Control, Event: string param. corrupted at backend

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Symptom
A custom control fires an event. SAP GUI send this event to the backend. In some cases it can happen, that the string parameter of the sent event received at the backend is corrupted.
Other terms
SAP GUI for Windows; sapgui;
Reason and Prerequisites
Program error
The custom control has set the string parameter by reference (and not by [...]

MaxDB: Corrupted DBCON entry for local system

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Symptom
The DBCON entry for the local system is corrupted and therefore, the database monitoring is disabled.
Other terms
MAXDB SDB ADA CORRUPTED DBCON LOCAL SYSTEM
Reason and Prerequisites
A program updates the DBCON table and produces an invalid entry for the local connection.
This problem can only occurr if the local system has a MaxDB database and the DBA [...]