I have just installed my first 6.99 Nightly with default settings.
I then copied an error free board from 6.07 and opened it - loads of DRC errors and warnings
The first one to look at is in this screenshot
Application: KiCad Schematic Editor (64-bit)
Version: (6.99.0-3551-g58b03b0a1c), release build
Libraries:
wxWidgets 3.2.1
FreeType 2.11.1
HarfBuzz 4.2.0
FontConfig 2.14.0
libcurl/7.83.1-DEV Schannel zlib/1.2.12
Platform: Windows 10 (build 19044), 64-bit edition, 64 bit, Little endian, wxMSW
Build Info:
Date: Sep 23 2022 07:20:35
wxWidgets: 3.2.1 (wchar_t,wx containers)
Boost: 1.79.0
OCC: 7.6.0
Curl: 7.83.1-DEV
ngspice: 37
Compiler: Visual C++ 1929 without C++ ABI
Build settings:
KICAD_SPICE=ON