Hi Mario,
Sorry for the delay in getting back to you.
1. I was able to see the groupBarItems disappearing issue. We will further investigate this issue and update you soon.
2. We had a similar issue in v.4.2.0.37 which has been fixed in the later patches. Please create a Direct-Trac incident (mention the forum link in the subject line) so that we can update with the download link
Defect #2290 - Containers anchored inside a tabPage gets reduced in size when closed and opened in designer.
Thanks,
Mano