Hi Krzysztof Wiacek,
We are investigating the menu merge issue, it is reported by some of our other customers as well.
Regarding the errors you experience I suspect that you have mixed version: if you take a look you will see assemblies form different dates loaded, plus I don't have a clue but you managed to load both DSL2008 and DSL2010 in the same VS (I guess it was VS2010)?
I think your re-install procedure didn't went so right. In order to be sure this is the case please do the following:
1. Uninstall the OpenAccess ORM
2. Clean the GAC (2.0 and 4.0) - we need to be sure nothing of the previous releases remains. You can do so like:
Open the Windows File Explorer. If you navigate to the C:\Windows folder you will see a folder named "assembly". Opening the folder provides you with a view of the 2.0 GAC - just search for assemblies names that have Telerik.OpenAccess.X, Telerik.Data.X or Telerik.VS.Data.Design and delete them. The same applies to the 4.0 GAC which can be found under the C:\Windows\Microsoft.NET\assembly\GAC_MSIL folder - please repeat the same action. After than making a clean OpenAccess install will solve the issue you have now is my expectation.
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