Both Rapture Pro and Dimension Pro will now only work using 44.1 with the ASIO in my MOTU 896 MkIII interface with the synths in standalone. They seem to want to do this change automatically and become unresponsive, again only in standalone, which I don't use often, but I was auditioning patches rather than starting Sonar at the time I noticed these behaviors. I generally use 96. In addition, Rapture Pro still takes an awfully long time time to load in standalone, but within Sonar Plat, loading Sonar as Admin seems to have solved this issue within a project.
 
Michael
"Studio Vheissu"

Try updating your audio interface drivers and firmware.
Try running the standalone apps as admin.

There are some hot keys that can change sample rates for Dim Pro, Rapture, and Rapture Pro.
 
I saved off the following from an older thread, some time ago, as I don't do this very often:
 
Dimension Pro and Rapture Microhost Hot Keys
The following are function keys to change aspects of Dimension Pro and Rapture global settings - these do not appear in the supplied documentation, but were posted in the Cakewalk forums:
 
ESC: All Notes Off
F1/F2: Open/Close z3ta+ Editor (mainly for testing purposes)
F3: Set to 44100
F4: Set to 48000
Shift+F3: Set to 88200
Shift+F4: Set to 96000
F5: Transpose -12
F6: Transpose -1
F7: Transpose +1
F8: Transpose +12
F11/F12: Previous/Next Program
Left/Right arrows: Bend down/up
Up arrow: CC1
Down arrow: CC2
Space bar: Aftertouch
(MIDI) Notes:
ZSXDCVGBHNJM,L.;/Q2W3E4RT6Y7UI9O0P-[
 
I hope the above helps you out.  All 3 programs seem to default to a 44.1 K sample rate on installation, but the hot keys above do work, and should fix this issue for you.
 
Bob Bone
 

This actually does appear in Rapture Pro's documentation, on page 128. 

Thanks for the documentation correction - the entirety of what I had posted came from an older thread that had copied and saved in a text document so that I could refer to the hot keys later.
 
I will remove the reference to it not being documented so that if I post the info again it will no longer claim it is not documented.  :)
 
Bob Bone