Symptom:
A Runtime Error occurs when a remote user tries to access the K2.net Workspace after it has not been used for some time.
http://forum.k2workflow.com/images/userimages/ws_runtime_err.gif

However, once I login as Administrator, I am able to get to the K2.net Workspace successfully. Thereafter, all other users are also able to access the K2.net Workspace. However, the same problem occurs after some hours of Workspace inactivity.

Resolution:
The issue appears to be related to ASP.NET's permission configuration on its work folders.

ASP.NET utilises a temporary ASP.NET files folder, typically found in C:WINDOWSMicrosoft.NETFrameworkv1.1.4322Temporary ASP.NET Files. What happens is some object files needs to be created in this folder when K2.net Workspace is accessed and the user coming from the client machine does not have "write" access to this folder.

A suggested resolution is to grant Modify and Write access to Authenticated Users on C:WINDOWSMicrosoft.NETFrameworkv1.1.4322Temporary ASP.NET Files. You should then restart IIS service and attempt to access K2.net Workspace from the client machine.