Hi,
I've managed to reproduce this issue.
I've tested against versions 6.3.0.6 and 6.3.1.8.
I've also attached a VS2005 solution which I used to recreate the issue.
Here are the steps to reproduce:
1. Add a ribbon control to your form. Derive your form from the ribbon control.
2. Add a ToolStripTab Item
3. Set a MinimumSize for the RibbonControlAdv.
4. Run the form
5. Minimise and maximise the ribbon a few times and observe the growth in height.
Not setting a minimum size rectifies the problem.
I understand that another version is being released in the first week of October. Hopefully this will already be fixed in that version.
If not, can this please be logged as an incident.
Thanks
Bhavesh
RibbonTest_b9ca8b5.zip