Quite a few users, especially those whose number systems use a different format to GB English, have been suffering breaking crashes and it has forced me to rebuild the user interface from scratch... however, a kind user on the CRUMB forum has tested a workaround for now that may be of use to some of you with problems.
Basically as a temporary measure, if you would like to use the current version of CRUMB before I get the big update, you need to change your system Locale to English(UK) and it will correct the internal issues with number exchanging between the simulation process and the UI
A guide how to do this can be found here https://www.isunshare.com/windows-10/change-system-locale-in-windows-10.html
Again, my deepest apologies for this issue and I am working as fast I can to get the updated version out as soon as I can!
All the best
Mike