The same problem happens to me using the browser version (without zoom) in Google Chrome.
I'm using it with Google Chrome (v. 79.0.3945.117 (off. Build, 64 bit), JavaScript V8 7.9.317.32 and Flash 32.0.0.31 (with chrome://version) with auto-updates) on Win7-Pro-64.
[I know it's old... I'm upgrading PC and OS now]