In NAV2009R2 (build 32012), try the following:
From the Start|Run dialog or a Command Prompt window, run the RTC with a page URL. My command line looks something like this:
"C:\Program Files (x86)\Microsoft Dynamics NAV\60\RoleTailored Client\Microsoft.Dynamics.Nav.Client.exe" dynamicsnav://localhost:7046/DynamicsNAV/MyCompanyName/RunPage?Page=21
After a while, this starts up the RTC, and shows the customer card page (#21). So far, so good.
However, when you run the exact same command line again (while the first RTC instance is still running), I get this:
Starting the first instance without a URL, and the second instance with a page URL has the same effect. Couldn’t find a fix for this in the PartnerSource Knowledge Base. Anybody else with the same problem?