I am not a faint heart, so I have tried your app (latest version 2.6.0.)
Unfortunately it does not work with my system: win 7 64 bit home premium.
The problem is related to .Net Framework and the error message is, in short:
Unhandled exception has occured in your ap....
Value cannot be nul.
Parameter name: input.
And a few details: Sys Arg NullExcep: value cannot be null...
It seems to be linked with regex, but I dont know.