Hi,
Thank you for letting us know about this issue. Regrettably, this seems to be a bug in the current version. I'm very sorry for this inconvenience. We will try fix it in the nearest version or in the next hotfix package for this particular Kentico
CMS version.
As a workaround - please add ClientID into the mentioned line of code.
// Register menu management scripts
ScriptHelper.RegisterClientScriptBlock(this, typeof(string), "Shortcuts" + ClientID, ScriptHelper.GetScript(script));
Best regards,
Ivana Tomanickova