problems hitting renderbutton

hi jerome
have some troubles here:
max 2011 design x64 win7
everything went ok till now.
I had to install Autodesk Design Rewiev and it bothered me not having installed Microsoft Visual C++ Redist 2008 sp1. but it was. unistalled those, installed new. no luck. and so on. I found on a forum the tip just to unistall every Visual C++ 200x also with Windows Installer Clean Up Utility and then try again. Autodesk Design Rewiev setup then will download the apropriate versions of Visual C++. This worked.
Now installed is:
- Microsoft Visual C++ 2005 Redistributable
- Microsoft Visual C++ 2008 Redistributable x64 9.0.30729.4148
- Microsoft Visual C++ 2008 Redistributable x86 9.0.30729.4148

(there can be installed different versions side by side for some reason, earlier were)

so now the problem. after a fresh max start everything works great. but after some working the solidrocks render button won't work. error messages:

-- Error occurred in refreshmini(); filename: C:\Program Files\Autodesk\3ds Max Design 2011\UI\MacroScripts\SolidRocksB09x.mse; position: 249941; line: 984
-- Defined in encrypted script
-- called in BTN_refreshMini.changed(); filename: C:\Program Files\Autodesk\3ds Max Design 2011\UI\MacroScripts\SolidRocksB09x.mse; position: 251118; line: 989
-- Defined in encrypted script
>> MAXScript Rollout Handler Exception: -- Runtime error: Unable to open renderer, possible recursion <<

can you help me?
thanks
boris