In the registry HKEY_LOCAL_MACHINE\SOFTWARE\Cakewalk Music Software there are two enries used by RPro/Session.

1. The "Cakewalk Content" path is stored in ContentDir. This value is used by most Cakewalk Software including Rapture Pro/Session. For Rapture Pro/Session this path is used to define where the "Rapture Pro" folder is located. This folder contains a variety of folders and files including the Programs, EG, SG and Logs. This value can be set in the Command Center.
2. The "Sample Data" path is stored in SampleDataDir. This value is used to hold the path to the folder holding the Multisample data. So far, I believe this is only used by RPro/Session. This is set in the RPro/Session installer.

 
In addition to these entries, there is an entry for each synth HKEY_LOCAL_MACHINE\SOFTWARE\Cakewalk Music Software\Rapture Pro and HKEY_LOCAL_MACHINE\SOFTWARE\Cakewalk Music Software\Rapture Session which among other things contain information about legacy Multsample paths.

scook

1. The "Cakewalk Content" path is stored in ContentDir. 
2. The "Sample Data" path is stored in SampleDataDir. 

OK, I know this will sound stupid, but once I get to HKEY_LOCAL_MACHINE\SOFTWARE\Cakewalk Music Software...ContentDir and SampleDataDir don't exist under that heading.
 
I'm sorry to be such a pain Scook, but am I missing something?

I did not think those entries were optional. Here is what they look like on my PC

Again, there can only be one ContentDir which is used for SONAR and Rapture Pro\Session so I guess this has already been changed in the Command Center and all the applications with the exception of Rapture Pro\Session which rely on this folder work correctly.

scook
I did not think those entries were optional. Here is what they look like on my PC

Again, there can only be one ContentDir which is used for SONAR and Rapture Pro\Session so I guess this has already been changed in the Command Center and all the applications with the exception of Rapture Pro\Session which rely on this folder work correctly.

Hey Scook,
 
Sorry, I was out of town for a couple of days.  OK, I see it now.  My ContentDir points to my G drive, but the SampleDataDir still points to the C drive.  So what's the best way for me to get everything moved to the same drive?  Or don't I want to do that?  
 
Again, I apologize if my knowledge on this is lacking.  It's only recently that I've taken to using these synths in the music I make.  So thank you for your time and patience.
 

Since you have already move the data SampleDataDir was pointing to, fix the registry entry to point to the new location. If you kept the "Cakewalk Content" directory structure and moved the entire thing over to G: the new SampleDataDir value be "G:\Cakewalk Content\Cakewalk Sample Data"
 
If the multisamples were not kept in "Cakewalk Content" then set SampleDataDir to the path holding the "Rapture Pro" multisamples folder. Do not include the "Rapture Pro" folder in the path, it must be the path containing the folder.