Possible Reasons:
ISSymbol version mismatch
ISSymbol not loading properly
Using a non-supported browser
Solution:
Configure the Internet Explorer settings to allow the control to run
Use a supported browser
Verify the ISSymbol version matches the EMSE version
Host the ISSymbolVM.cab file locally
ISSymbol version mismatch
ISSymbol not loading properly
Using a non-supported browser
Solution:
Configure the Internet Explorer settings to allow the control to run
Use a supported browser
Verify the ISSymbol version matches the EMSE version
Host the ISSymbolVM.cab file locally