Hello,
If you are using shared folder on the TSplus server which is hosted on a Windows 7 operating system then it is a normal behavior as it is related to a windows limitation. On Windows 2012 you do not have this limitation because of users Cal's allows you to do network sharing on the number of cals purchased. This limitation is active for shared drive accessible with net use command.
To overcome this limit you can either purchase a NAS based on Linux or use the subst command instead of the net use. For example if you publish a logon script with command :
subst T: C:\Shared folder
All your users will then be able to display a T: drive in their session with the content of the C:\Shared folder.
You can also publish this shared folder using the folder application, more information about this can be found here :
http://www.terminalserviceplus.com/docs/folder
If your goal is to publish the content of a folder with an exclusive access to each users then follow this procedure :
http://support.tsplus.net/kb/faq.php?id=25
and in the generated script type in the path of your application subst Y: C:\Users\%USERNAME%\your folder
Doing so your user will be able to have access to this drive letter Y:, which will be pointing to their exclusive profile folder. Of course this is only an example.
If you would prefer to redirect their local "My documents" folder or any other specific folder then type in :
subst Y: \\tsclient\c\Users\%USERNAME%\Documents
The final step is to publish an application that will secure the Y: of each users, preventing them from accessing the whole server. To do so, open an admin tool, go to the application tile and click on "Application publishing". Add the folder application located in C:\Program Files (x86)\TSplus\UserDesktop\files.
In the command line option, set the path of your application (Y: in the example above). The last step is to publish this application to your users / groups. Doing so your users will only have access to the content of this folder.