Child theme Executive problems with Buddypress

Dear Sir/Madam,

We recently purchased the Executive cild theme and were very happy with it.
We stumble into a lot of problems though with the integration of Buddypress:

The buddybar looks all smeared and can't be used
Searches don't work at all, so I had to find a workaround by automatically adding all new members to a specific group that is now used as a members directory
The forum looks terrible http://kennisportal.sednasoftware.com/forums/
There are huge differences between the looks in different browsers

I'm not a programmer, zo I'm afraid changing all these things will be a time consuming and very expensive job.
Do you have a good tip for me?
Can we make it work on the Child executive theme which we loved http://kennisportal.sednasoftware.com/ or do we have to go for another theme. And if so, is there any theme very similar that does work perfect with Buddypress?

Thank you very much in advance!

Best regards,
Karin Vinke