For anyone who did not upgrade yet, please run Viacoin Core 0.15.2 which fixes the Denial-of-Service vulnerability CVE-2018-17144
This bug was also found in Bitcoin Core versions 0.14.0 up to 0.16.2
If you are running an older version, shut it down. Wait until it has completely
shut down (which might take a few minutes for older versions), then run the
installer (on Windows) or just copy over /Applications/Viacoin-Qt (on Mac)
or viacoind/viacoin-qt (on Linux).
The first time you run version 0.15.0 or higher, your chainstate database will
be converted to a new format, which will take anywhere from a few minutes to
half an hour, depending on the speed of your machine.
The file format of fee_estimates.dat changed in version 0.15.0. Hence, a
downgrade from version 0.15 or upgrade to version 0.15 will cause all fee
estimates to be discarded.
Bootstrap for Viacoin 0.15+ is available: https://bootstrap.viacoin.org/
Thank you for providing the latest updates, the explanation here is also quite clear. If there are more bugs found, hopefully they can be resolved quickly. Great!