Excel (Office 365 ProPlus) : Active X TextBox not working correctly

[Selma_Lai]

Dear Team,

I added an ActiveX TextBox into my Excel. 
Now when I try to type smth. in, another text box appears which I cannot click on (it appears and disappears). Therefore, I cannot write into the first text box.
 Note:  I exited the design mode

What can I do?

Maybe the reason lays in the "Security Update Microsoft Windows KB4489882 or KB4485447 - which were recently installed ?

Thanks a lot

[#2]

Also having the same problem @Selma_Lai 
Have you found a solution at all?

[#3]

I do have the same issue, do you manage to solve yours? @Selma_Lai 

[#4]

@julelui I think I've managed to find the root cause of my issue - it turned out that using a secondary monitor with duplicate display setting was the reason, however I have not identified why so only resolution I found so far is to unplug the extended display

[#5]

@julelui : yes, I replaced it with a normal text box, which worked for my requirements.
Even though I lock my excel, I can type into this text box by unclicking the "lock text" property under "format". However, this is of cause not the solution for the initial problem - nevertheless, I hope it helps