Ah, thanks! The application log was what I was looking for.
Just as a note to anyone else that may come across this...
It turned out to be this error...
[06-26 11:36:36,Telerik.TestStudio.exe(2700:1),Error] BugTrackersLoader.LoadSystems() : EXCEPTION! (see below)
Situation: Error loading bug trackers in "C:\Program Files\Telerik\Test Studio\Bin\Plugins\BugTrackers\TestStudioEventumPlugin.dll".
Outer Exception Type: System.NotSupportedException
Message: An attempt was made to load an assembly from a network location which would have caused the assembly to be sandboxed in previous versions of the .NET Framework. This release of the .NET Framework does not enable CAS policy by default, so this load may be dangerous. If this load is not intended to sandbox the assembly, please enable the loadFromRemoteSources switch. See http://go.microsoft.com/fwlink/?LinkId=155569 for more information.
HRESULT: 0x80131515 (Official ID (if app.) = COR_E_NOTSUPPORTED, Error Bit = FAILED, Facility = FACILITY_URT, Code = 5397)
at System.Reflection.RuntimeAssembly.nLoadFile(String path, Evidence evidence)
at System.Reflection.Assembly.LoadFile(String path)
...which, although she is not using a networked location for any files, looks like it is related to the Standalone version of Test Studio using .net 4.0 instead of 3.5 as my Express version, and the call I highlighted in the trace log above...
I was able to add loadFromRemoteSources in the runtime config, as demonstrated in this link...
(although, I think I had to add it to Telerik.TestStudio.exe.config instead of the config file listed in the link.... will have to do more testing later to make sure which file requires the change)
A few other links that are helpful...