I notice that with the Standard nightly R3919 (same behaviour with Experimental), pre-signals do not behave in the way in which they did before (probably following the change to the block management system recently), with the result that, on the demo.sve for pak128.Britain (both the latest version and the second latest version), trains get permanently stuck at the pre-signal at the Christminster North station, whereas they did not before. I am currently unsure whether this is a bug with the current code, or a badly designed signalling system that only worked owing to a bug with the previous code that has now been fixed.