I get a several errors when starting 2020b

I recently upgraded to 2020b from 2020a. I now get the following error messages upon starting up The first message, I get routinely in 2020a and was hoping that 2020b would fix that error. It seems to arise from the use of the live editor. The other error messages I've not seen before. As matlab.mat could not be loaded, I loaded a copy from another location successfully. I then exited the program from my startup folder and then received the same error message regarding matlab.mat upon starting up the next time. Any ideas on all of these errors???

Warning: Name is nonexistent or not a directory: C:\Users\mhrov\AppData\Local\Temp\Editor_vxdxq

Warning: Name is nonexistent or not a directory: C:\Program Files\MATLAB\R2020b\toolbox\matlab\project\dependency_viewer

Warning: Name is nonexistent or not a directory: C:\Program Files\MATLAB\R2020b\toolbox\matlab\registration_framework\matlab

Warning: Name is nonexistent or not a directory: C:\Program Files\MATLAB\R2020b\toolbox\simulink\sldependency

Home License -- for personal use only. Not for government,

academic, research, commercial, or other organizational use.

Warning: Executing startup failed in matlabrc.

This indicates a potentially serious problem in your MATLAB setup, which should be resolved as soon as possible. Error detected was:

MATLAB:load:unableToReadMatFile

Unable to read MAT-file C:\Users\mhrov\Documents\MATLAB\matlab.mat. File might be corrupt.

Unrecognized function or variable

'matlab.internal.editor.EvaluationOutputsService.prewarmExecution'.

Unrecognized function or variable

'matlab.internal.editor.EvaluationOutputsService.prewarmExecution'.

[Walter Roberson]

For the first series of problems

restoredefaultpath
rehash toolboxcache 
savepath

Do you have your own startup.m in your MATLAB directory? If so rename it for the moment.

[Mirko Hrovat]

Thank you, that seemed to fix all of the problems.