Her is some additional information about this issue :

The error in RealBand 2010.5 build 2 still occurs with the Roland V-Studio 100 with the latest 2.0 driver (Win 7 64)! It is most certainly a sample rate issue. There are a couple of strange things: The reported filetype in Audio is normal set to 16-Bit, 44.1 Khz. After the error occurred its not possible to select an ASIO-driver anymore because this causes another access violation error and hangs the program. What I notice below in the ASIO driver dialog however is a <no> with all optional sample rates including 44.1 Khz. Before the error occurs it reports <yes> at the 44.1 Khz option. Another strange thing is the Midi-Setup. I put VS-100 In and Out on top. Though after the error occured they lowered on the list and the Microsoft GS Wavetable synth is on top. Somehow the program changes the selected Midi In and Out by itself?

greetings,

Valentino