The grinding cables in the encore version of Highrise Havoc aren't loading for me... either that or they are intentionally missing and are being replaced with red and yellow exclamation marks.
I'm having similar issues whenever I try to host this pack in multiplayer, I came here looking for a fix but it doesn't seem like anyone here has one...
EDIT: I figured out what my issue was, there seems to be a lua conflict with the rails on Highrise Havoc and the shortcut on Bellbridge Zone from the Marsh Mayhem Pack.
If Marsh Mayhem is loaded first then Highrise Havoc is completely broken and if this pack is loaded first then the shortcut on Bellbridge Zone is broken. For now I guess I'll just have to hope for there being a fix for this soon.