Windows7 64 bit, docking/redraw doesn't work

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C#

My Application is built with AnyCPU.
(I use DevExpress components and C1 components.)

When i run my Application on a 32 bit system everything is fine.
On a 64 bit system i have many problems.

For Example:
I minimize my Main Form an resize it again.
My controls will not dock. Same controls become transparent.
When i collapse a panel i have the same effects.

Is there a general problem with 64 bit?
(Application.DoEvents(), Redraw, SuspendLayout, ResumeLayout, BringToFront, have no effects.)


Thanks