Player frame reverts to default and the party/raid/target/targettargert frames are missing altogether.

1x SUI_UF_pet:SetPoint(): Couldn't find region named 'SUI_UF_player'
[string "=[C]"]: in function SetPoint' [string "@Interface/AddOns/SpartanUI/modules/UnitFrames/Framework.lua"]:87: in function PositionFrame'
[string "@Interface/AddOns/SpartanUI/modules/UnitFrames/Framework.lua"]:151: in function <...ce/AddOns/SpartanUI/modules/UnitFrames/Framework.lua:144>
[string "=[C]"]: ?
[string "@Interface/AddOns/Atlas/Libs/AceAddon-3.0-13/AceAddon-3.0.lua"]:66: in function <...face/AddOns/Atlas/Libs/AceAddon-3.0/AceAddon-3.0.lua:61>
[string "@Interface/AddOns/Atlas/Libs/AceAddon-3.0-13/AceAddon-3.0.lua"]:523: in function EnableAddon' [string "@Interface/AddOns/Atlas/Libs/AceAddon-3.0-13/AceAddon-3.0.lua"]:536: in function EnableAddon'
[string "@Interface/AddOns/Atlas/Libs/AceAddon-3.0-13/AceAddon-3.0.lua"]:626: in function <...face/AddOns/Atlas/Libs/AceAddon-3.0/AceAddon-3.0.lua:611>

Locals:
(*temporary) = SUI_UF_pet {
0 =
__tags =

{
}
PLAYER_ENTERING_WORLD = defined @Interface/AddOns/SpartanUI/libs/oUF/ouf.lua:73
Range = {
}
DispelHighlight = Texture {
}
UNIT_PET = {
}
UNIT_HEALTH_FREQUENT = defined @Interface/AddOns/SpartanUI/libs/oUF/ouf.lua:1082
UNIT_MAXHEALTH = defined @Interface/AddOns/SpartanUI/libs/oUF/ouf.lua:1082
__elements = {
}
unitOnCreate = "pet"
raised = Frame {
}
PARTY_MEMBER_ENABLE = defined @Interface/AddOns/SpartanUI/libs/oUF/ouf.lua:1082
Portrait3D = PlayerModel {
}
Castbar = StatusBar {
}
UNIT_DISPLAYPOWER = defined @Interface/AddOns/SpartanUI/libs/oUF/ouf.lua:1082
style = "SpartanUI_UnitFrames"
elementList = {
}
UNIT_EXITED_VEHICLE = defined @Interface/AddOns/SpartanUI/libs/oUF/ouf.lua:73
UNIT_POWER_BAR_SHOW = defined @Interface/AddOns/SpartanUI/libs/oUF/ouf.lua:1082
UNIT_CONNECTION = {
}
Debuffs = petDebuffs {
}
Portrait = PlayerModel {
}
UNIT_POWER_BAR_HIDE = defined @Interface/AddOns/SpartanUI/libs/oUF/ouf.lua:1082
DB = {
}
UNIT_MAXPOWER = defined @Interface/AddOns/SpartanUI/libs/oUF/ouf.lua:1082
RaidTargetIndicator = Texture {
}
unit = "pet"
UNIT_POWER_FREQUENT = defined @Interface/AddOns/SpartanUI/libs/oUF/ouf.lua:1082
config = {
}
UNIT_FACTION = {
}
RAID_TARGET_UPDATE = defined @Interface/AddOns/SpartanUI/libs/oUF/elements/raidtargetindicator.lua:62
UNIT_AURA = defined @Interface/AddOns/SpartanUI/libs/oUF/ouf.lua:1082
UNIT_ENTERED_VEHICLE = defined @Interface/AddOns/SpartanUI/libs/oUF/ouf.lua:73
UNIT_SPELLCAST_SENT = defined @Interface/AddOns/SpartanUI/libs/oUF/elements/castbar.lua:114
IsBuilt = true
PARTY_MEMBER_DISABLE = defined @Interface/AddOns/SpartanUI/libs/oUF/ouf.lua:1082
Health = StatusBar {
}
unitEvents = {
}
SpartanArt = Frame {
}
ThreatIndicator = Texture {
}
ElementUpdate = defined @Interface/AddOns/SpartanUI/modules/UnitFrames/SpawnFrames.lua:98
Portrait2D = Texture {
}
Name = FontString {
}
Power = StatusBar {
}
UpdateAll = defined @Interface/AddOns/SpartanUI/modules/UnitFrames/SpawnFrames.lua:48
Buffs = petBuffs {
}
elementDB = {
}
ClassIcon = Texture {
}
}
(*temporary) = "BOTTOMRIGHT"
(*temporary) = "SUI_UF_player"
(*temporary) = "BOTTOMLEFT"
(*temporary) = "20"
(*temporary) = "0"

Not reproduceable, if still an issue for you please see if there are other errors.