Hi Markus-
Make sure that you have Studio One Pro and Maschine pointed at the correct folders. There are different .dll files for the 64 and 32 bit versions of UltraChannel, so make sure that you have your program looking at the correct version.
The 64-bit version is stored at C:Program FilesCommon FilesSteinbergVST2, while the 32-bit version is stored at C:Program Files (x86)Common FilesSteinbergVST2
Let me know if that does not solve the problem!
Tom Longabaugh
Eventide
