DLL's built on my build machine, copied locally do not show any coverage

c:\dotcover\dotcover.exe cover /TargetExecutable="%xunit20%\xunit.console.exe" /TargetArguments=".\UnitTests.dll" /output="./foo.dcvr" /LogFile=".\dotCoverLog.txt" /LogLevel=Trace

PDB and DLL are there, the tests run, the DLL is not listed in the report. If I build locally and substitute the DLL and PDB - I do get coverage.

Is this a known limitation?