The game hanging on "Initializing" when loading a savegame is a known issue:
https://forums.civfanatics.com/threads/increase-memory-on-64bit-machines.544026/page-2#post-15744292
https://www.reddit.com/r/CivIV/comments/d2vveb/delays_while_reloading/
https://forums.civfanatics.com/threads/first-load-superfast-but-subsequent-loads-superslow.522798/
https://forums.civfanatics.com/thre...-to-reduce-loading-times.286023/#post-7111906
I think it can only occur in full-screen mode, and Alt+Tab seems to finish the "Initializing" step immediately.
Spoiler links :
https://forums.civfanatics.com/threads/increase-memory-on-64bit-machines.544026/page-2#post-15744292
https://www.reddit.com/r/CivIV/comments/d2vveb/delays_while_reloading/
https://forums.civfanatics.com/threads/first-load-superfast-but-subsequent-loads-superslow.522798/
https://forums.civfanatics.com/thre...-to-reduce-loading-times.286023/#post-7111906
Speaking of known – but not all that widely known – issues: I've recently noticed that incorrect combat odds are displayed when the attacker's damage limit is a multiple of the per-round damage, e.g. when one healthy Cannon attacks another. The Advanced Combat Odds mod (if enabled in BULL) gets it right (through this bugfix): 50% odds of survival is correct, BtS shows 63.7%.Unless the displayed odds are failing to calculate some variable, then I doubt this.And you could say it was bad luck but no way as it happens WAY too often imo....