FAQ

Why can't the buyer/renter of the region build inside of it?

Make sure there is no build, block-break and block-place flags on the __global__ region. Remove those flags with /rg flag __global__ <flag> and instead set passthrough to deny with /rg flag __global__ passthrough deny. This change will make everything protected by default, while still allowing other regions to override protections.
Make sure that all other regions that are at the same spot of the AdvancedRegionMarket region have no build, block-break and block-place flags. Regions are protected by default, so these flags are not required and will cause issues.
Make sure that the AdvancedRegionMarket region has the highest priority (If flagGroups are enabled (config.yml), AdvancedRegionMarket sets the priority to 20 by default).
Make sure the walls/floor/ceiling of your region are not made of concrete. There is a bug in WorldGuard that prevents placing blocks against concrete, even it players are supposed to be able to do that.

Video tutorials - Watch and learn with Major Graft.
Create a region
Region settings
Presets - Define region settings before creating a region.
Autoprices - Calculate the price of a region automatically.
Regionkinds - Regionkinds and RegionkindGroups can be assigned to your regions to group them together and bring them into a context.
Limits - Limit the number of regions a player can buy.
Inactivity reset & Takeover - Automatically reset a region because of inactivity or let members of regions with inactive owners become the new owner.
FlagGroups - Assign certain flags to a region depending on its state.
Entitylimits - Limit the type and number of entities a player is allowed to have on a region.

Discord - Get involved with other AdvancedRegionMarket Admins, Plugin Developers, Testers. Support, General Discussion welcome.