Thanks for your reply.
Here's what I already done before it happened.
1.I copy the resource file in default folder and put it into favorite folder before I used it. At first, it worked very well.
2.While I'm drawing a cad and try rendering it into fast render for showing my coworkers, somehow the software no respond and crushed.
3.After I reopened the software, I open the file which losing a part of drawing which I done before crush.
4.I try to insert the symbols from favorite folder again and found that after I edit the focus point, the symbol became white rectangle like this picture(https://i.imgur.com/nQlxnDJ.jpg).
5.I try to test it with opened the resource file in default folder and inserted the symbol from default folder's resource. It shows the same problem.
6.I opened a new blank file with every empty for testing. Before insert any symbol I make sure it's all empty in my file resource browser. Inserted symbols from default folder and favorite folder and setup the focus point. It shows the same problem.
Because I couldn't fix it but I still got plan to draw, today I download a new resource files from others and found that symbols were fine and never get into this situation.
So I guess the default resource file were damaged during the unknown crush, and maybe losing the rendering data or something. That why if I edit the focus information, the system couldn't understand it's model so turn it into a while rectangle?
And here's another strange thing happened today.
While I'm using snap to grid, I double click it into the SmartCursor setting. After I set the grid information and click ok button. I found that I couldn't leave SmartCursor setting and it takes me to Angle setting. Shows that Angle from Axes setting had some problem so I couldn't click ok button. If fix when I type any numbers for Angle from Axes but show up everytime when I get into SmartCursor setting. Even I pressed reset button it's the same.
You can check the video I uploaded.
Super wired, why do these things happened to me LOL.
Untitled.mp4