Hi Udo,
The problem you are describing is not common. I don't remember I've seen it before.
Most likely, there are some specifics in your application that TestComplete does not handle properly (as far as I can see, the app does not resize the panels). Currently, for me, it's difficult to determine what goes wrong. Maybe the problem is caused by some plug-ins that are included and enabled in TestComplete, but not used in your Delphi application testing. So, I'd suggest turning off these plug-ins. To do this:
* Close your tested application.
* In TestComplete, select File | Install Extension from the main menu. This will invoke the Install Extensions dialog.
* In the dialog, find the "Open Applications Support" plug-in and clear its Active check box. Click OK.
TestComplete will disable the plug-in and will display a message box asking for your permission to disable all the dependent plug-ins. Select Yes to disable them.
* Open the Install Extensions dialog again and now, enable the "Open Applications Support" and "Delphi and C++Builder Open Applications Support" plug-ins. They are needed for your Delphi application testing. Click OK to apply the changes and to close the dialog.
* Restart TestComplete. Launch your application and check whether the problem persists.
If this does not help, I'd suggest that you sign up for a TestComplete 8 trial and check your application with this version.