I've finally found a solution.
Enable logging of refresh errors of published diagrams on Sharepoint web
Modify Microsoft.Office.Visio.Server.OperationsManager.dll.config on sharepoint server.
<?xml version="1.0"?>
<configuration>
<appSettings>
<add key="EnableLog" value="True" />
<add key="LogPath" value="\\sharepointserver\logs" />
</appSettings>
</configuration>
Then on next shape refresh you should find log in path
\\sharepointserver\logs. My problem was in account. I get a wrong account access to SCOM server (Read-Only Operator)
Jan Marek WBI Systems Czech Republic, j.s.c MCP | MCT | MCITP | MCTS