  We present two new epochs of Hubble Space Telescope/Space Telescope Imaging
Spectrograph coronagraphic imaging, along with multi-epoch optical, near-IR,
and radio monitoring, of the HD 163296 system. We find ansae features
identified in earlier epoch HST imagery are a 4th ring, that resides at a
semi-major axis distance of 3.25" (330 au). We determine the scale height of
the dust is 64 au at a radial distance of 330 au. We observe surface brightness
variations in the 4th ring on <3 month timescales, including large-scale,
azimuthally asymmetric changes. This variability resembles earlier studies of
the innermost disk ring (0.66", 67 au), suggesting a common origin. We find no
evidence for the ejection of new HH-knots predicted to occur in 2018. Moreover,
our non-detection of older HH-knots indicate the knots could be experiencing
less shock-heating. We also detect one clear dipper event in our optical light
curve from 2018. Using the time-scale and spatial extent of disk illumination
changes we observe, we estimate the source of this shadowing resides within 0.5
au from the star, must extend at least 0.08 au above the midplane of the disk,
and has an azimuthal extent of 0.26 au. We estimate the source of the dipper
event reaches a scale height of 0.37 au above the midplane at 0.41 au, and has
an azimuthal extent of 0.3 au. We suggest these similarities could indicate the
same (or similar) mechanisms are responsible for producing both dippers and
variable ring illumination in the system.
