Return of Reckoning

If you're getting this line of code in your error log:

at System.Diagnostics.PerformanceCounterLib.GetStringTable(Boolean isHelp)
at System.Diagnostics.PerformanceCounterLib.get_NameTable()
at System.Diagnostics.PerformanceCounterLib.get_CategoryTable()

You need to rebuild performance counters ...

I've got same situation. When running the RoRLauncher shows error:

Data.myp:
System.InvalidOperationException: Cannot load Counter Name data because an invalid index '' was read from the registry.
at System.Diagnostics.PerformanceCounterLib.GetStringTable(Boolean isHelp)
at System.Diagnostics ...