Internet Explorer 11 will be retired by Microsoft on June 15, 2022. Microsoft 365 and other Microsoft apps already ended support on August 17, 2021. I don't think that putting effort in supporting IE11 is worthwhile.
Thank you, Xavier. I use IE because I have some automations in VBS that only work in that browser, for example to manage the dialogue to load photos (12 cliks automated to one click). I am testing (not in Numista) to move to java+selenium and getting rid of IE.
Now the issuers list is shown, but some other dropdown lists are not populated: rulers, currency and permitted web pages.
Referee for Spain, Iberia (ancient), Suebi Kingdom and Visigothic Kingdom
I felt it was important to fix the issuer dropdown list because the fix was easy and it also impacted the coin search.
I'm not able to reproduce the second issue you mentioned, and I don't wish to spend too much time on investigating issues with IE. I recommend you move to another solution with a more modern browser. I heard some people using iMacros.