That suggests to me that you have defined or downloaded a function that shadows one of the built-in functions used inside hgrc.m. If we look at line 154 of hgrc.m and its neighbors:
dbtype 150:160 hgrc.m
150 clear startup_exists
151 end
152
153 catch exc
154 warning(message('MATLAB:matlabrc:InitHandleGraphics', exc.identifier, exc.message));
155 end
we see that it's executed when some code in the try section of the try / catch block throws an error.
Try editing hgrc.m located here (replace MATLABROOT with the root directory of your installation)
replace(string(which('-all','hgrc')), matlabroot, "MATLABROOT")
ans = "MATLABROOT/toolbox/matlab/graphics/hg/hgrc.m"
and add a keyboard statement right after the try keyword (on the next line after it) at the start of hgrc.m. Then run the steps that reproduce the warning. When MATLAB enters debug mode (the K>> prompt) step through using the debugging tools in MATLAB to determine which line in hgrc.m throws the error. Use which to check the functions being called on that line to make sure the MATLAB functions aren't being shadowed; for example if it's throwing the error from the floor function calls on line 46: dbtype 46 hgrc.m
46 left = floor(left); bottom = floor(bottom);
check that you don't have a floor.m that conflicts with the built-in floor function.
which -all floor
built-in (/MATLAB/toolbox/matlab/elfun/@char/floor) % char method
built-in (/MATLAB/toolbox/matlab/elfun/@double/floor) % double method
built-in (/MATLAB/toolbox/matlab/elfun/@int16/floor) % int16 method
built-in (/MATLAB/toolbox/matlab/elfun/@int32/floor) % int32 method
built-in (/MATLAB/toolbox/matlab/elfun/@int64/floor) % int64 method
built-in (/MATLAB/toolbox/matlab/elfun/@int8/floor) % int8 method
built-in (/MATLAB/toolbox/matlab/elfun/@logical/floor) % logical method
built-in (/MATLAB/toolbox/matlab/elfun/@single/floor) % single method
built-in (/MATLAB/toolbox/matlab/elfun/@uint16/floor) % uint16 method
built-in (/MATLAB/toolbox/matlab/elfun/@uint32/floor) % uint32 method
built-in (/MATLAB/toolbox/matlab/elfun/@uint64/floor) % uint64 method
built-in (/MATLAB/toolbox/matlab/elfun/@uint8/floor) % uint8 method
/MATLAB/toolbox/matlab/datatypes/tabular/@tabular/floor.m % tabular method
/MATLAB/toolbox/matlab/datatypes/datetime/@datetime/datetime.m % datetime method
/MATLAB/toolbox/matlab/datatypes/duration/@duration/floor.m % duration method
floor is a built-in method % matlab.internal.capability.Capability method
floor is a built-in method % connector.internal.LoggerLevel method
floor is a built-in method % matlab.lang.OnOffSwitchState method
floor is a built-in method % matlab.internal.reference.property.RefEntityType method
floor is a built-in method % matlab.internal.reference.api.EntityPrecision method
floor is a built-in method % matlab.internal.reference.property.DeprecationStatus method
floor is a built-in method % matlab.internal.reference.property.FunctionType method
floor is a built-in method % matlab.internal.reference.property.SyntaxType method
floor is a built-in method % matlab.internal.reference.api.EntityCaseSensitivity method
floor is a built-in method % simulink.FindSystemTask.Status method
floor is a built-in method % mf.zero.meta.Language method
floor is a built-in method % dig.config.CommandType method
floor is a built-in method % dig.config.HorizontalAlignment method
floor is a built-in method % dig.config.ResourceState method
floor is a built-in method % dig.config.ResourceType method
floor is a built-in method % dig.model.DisplayState method
floor is a built-in method % dig.model.EventDataType method
floor is a built-in method % dig.model.FunctionType method
floor is a built-in method % dig.model.ValidInBdType method
floor is a built-in method % dig.model.ViewMode method
floor is a built-in method % matlab.unittest.internal.fixtures.FolderScope method
floor is a built-in method % matlab.automation.Verbosity method
floor is a built-in method % matlab.internal.timer.CallBackTypeEnum method
floor is a built-in method % matlab.internal.timer.BusyModeEnum method
floor is a built-in method % matlab.internal.timer.ExecutionModeEnum method
/MATLAB/toolbox/matlab/bigdata/@tall/floor.m % tall method
built-in % gpuArray method
/MATLAB/toolbox/nnet/deep/@dlarray/floor.m % dlarray method
/MATLAB/toolbox/parallel/array/distributed/@codistributed/floor.m % codistributed method
/MATLAB/toolbox/parallel/gpu/gpu/@gpuArray/floor.m % gpuArray method
/MATLAB/toolbox/symbolic/symbolic/@sym/floor.m % sym method
Once you've finished your debugging, go back to hgrc.m and remove the keyboard call since you don't want MATLAB to enter debug mode in that file every time you restart it.
