Too much errors/messages in Web Analysis reports stops workspace

Question

Too often workspace stops to work for the client with the following (example) messages. It seems that too much informational and error messages from reports (like a non working report link or missing member) gives the workspace client so much trouble that login off or closing the browser is the only solution. This seems not the right workaround. Anyone experiencing the same?
Internet Explorer popup:
Line: 2608
char: 4
Error: 'undefined'is null or not an object
Code: 0
URL: https://[workspaceserver]/workspace/index.jsp
{next}
Internet Explorer popup:
Line: 2688
char: 3
Error: 'undefined'is null or not an object
Code: 0
URL: https://[workspaceserver]/workspace/index.jsp
In a Hyperion(r)Workspace-error popupscreen:
An error was encountered while closing all content
Can only remove children
Internet Explorer popup:
Line: 1385
Char: 4
error: 'this.leftComp.getDataModel()'is null or not an object
Code: 0
URL: https://[workspaceserver]/workspace/index.jsp

Answer 1

it seems that all errors are related to the migrated anaqlyzer report. In the new 931 version less characters are allowed to use than the old 71 version.
In the main name of the reportgroup the migration just rplaces the wrong characters. But links and url insite reportgroups and reports are not changed during migration. Activating (clicking on it) such links is the main cause of the freeze.