On a page, have the following text
“1;2; {3};4;{5};6;{7;};8;;;;;;;;;;;;;;
a;b;c;d;e;f;”.

Now replace all (Ctrl+H) and put Find What:; and Replace With:,
Now press Ctrl+Alt+Enter so that it replaces all.

In my editor I get the following output:
“1,2; {3};4;{5};6;{7;};8;;;;;;;;;;;;;;
a,b,c,d,e,f;”

I have version 2.0.1 Build 2217

Cannot repro. My semicolons replace fine. Are you replacing in selection?