Steam Wcml South Overground Signals Stuck On Red

I'm a big fan of the WCML South, but having attempted several timetable runs in the Class 710 on the overground section from Euston to Watford Junction, I'm still yet to complete a run without encountering a red signal that gets stuck and won't change.

The Lioness Line is a great addition to the WCML South route and often overlooked by many, but it's a shame it's so buggy on PC (For me at least).