Multiple blank uncloseable events windows (screenshot 1) appear. If save-load then additional event window appear (screenshot 2).
No mods installed.
DLC installed:
Sword of Islam
Legacy of Rome
The Republic
The Old Gods
Sons of Abraham
Rajas of India
Sunset Invasion (disabled)
Multiple portrait and unit packs
Launcher version: 2.3 (BTOF)
In-game version: 2.3 (RCIN)