Button "Add Connector" missing since Update to 1.2.5

Hello,

we updated to DataSynchronizer 1.2.5 Build: 250 and today to build 299 and we're missing the button to add a new connector.

We tried this also an a second "Testsystem" with the same issue.

How could we add a connector on version 1.2.5?

Could anyone help me or tell me something about this issue?

Thanks,

Michael