problems with SQL-Studio after Update from 7.4.3.6 to 7.4.3.17

Hi,

in connection with a 7.3-7.4 migration I updated my SQL-Studion from 7.4.3.6
to 7.4.3.17 using the sqlstudio74-setup.exe.
At first everything seemed to work fine, but after rebooting my system I
sometimes get the following error-alert's when using menu-commands as
Table -> show content

Module: Result
Function: UserControl_Initialize
Error No 372
Failed to load control 'NavigateBar' from SQLStudionCCon.ocx. Your version
of SQLStudionCCon.ocx may be outdated. ...

The SQLStudionCCon.ocx is from 26.03.2003. The Help - About - Info show's
the correct version 7.4.3.17.

What can I do?

Thanks an regards
Georg