So I have been pretty addicted to this mod for the last few months and have been playing quite a bit, and this bug has surfaced on all of my heroes around when I reach level 40 or so. When playing the C. Campaign, all buildings, research and units become free. For example, keep level 2 will be grayed out because I don't have the resources for it but when I click it to queue it up, it immediately starts regardless of not having enough. Whatever resource(s) I needed more of will simply go to zero then rise back up normally. Like stated earlier, this affects building construction, research and units too. Oddly enough, this bug also causes all research to become available immediately as well. For example, you can research level 5 famine at keep level 1 (before famine 1-4), dark mithril as soon as you build a boneyard, etc. Units, buildings and building upgrades, however, still need to have their prerequisites met. As far as I can tell, this bug affects the C. Campaign mode exclusively, as it isn't present when I play skirmish maps.
Some things that I have tried to fix the issue:
Completely uninstall/delete and then re-download mod. (twice actually)
Change windows service packs.
Downloaded the vanilla campaign.
Wipe all hero/map save data from documents.
None of these changed the inevitable, the glitch shows up around hero level 40 and essentially level caps me off from playing C. Campaign legitimately. Sure it was fun building a base half the size of the map and annihilating everything a few times, but the novelty has worn off. If anyone knows of a fix or has had the same problem, leave a reply. Thanks for your time.
Edit: I should also say I am playing the current patch 8.8b and play on Hard difficulty