I've got a form that is throwing an error on a disable form. Error text is as follows:
control.className.indexOf is not a function
If the rule is changed to Hide or Invalidate it works fine. This behavior exists in 2 different environments. Someone else on my team discovered this issue, so I replicated it on my own site. Seems like a bug.
This error only seems to happen when the disable rule is applied to a panel. It works fine when applied to a control, or multiple controls.