Can't customize Symbols

[ShaningYu]

I launched Pro and loaded a dozen of layers from MapService.  These layers have their symbols defined already.  I want to customize them.  However, after I launch a layer's Symbol panel, the Pro gets to closed automatically just in about 3-4 seconds.  Is it a SW defect?  Or how can I avoid it and do the symbol customization?  Thank you if you can share your experience.

[SamuelCanas]

Hi @ShaningYu , 

It is possible that this may be an unexpected behavior of older versions of the software. Which version of ArcGIS Pro do you have? I´ve tried to replicate this behavior with the 3.1 version but it didn't close after launching symbology. Maybe you can try updating and it can get fixed! 

I hope this can help you, 

Samuel  

[ShaningYu]

Looks to be a defect of SW.  Thanks.