Macs with IE causing viewstate error

[Joel Barsotti]

So when mac users hit the back button in their browsers they often are
getting an error page.

Is there anyway to handle this?

message:
The viewstate is invalid for this page and might be corrupted.

Target:
System.Object LoadPageStateFromPersistenceMedium()

Stack Trace:
at System.Web.UI.Page.LoadPageStateFromPersistenceMedium()
at System.Web.UI.Page.LoadPageViewState()
at System.Web.UI.Page.ProcessRequestMain()

Source:
System.Web

Target Site:
System.Object LoadPageStateFromPersistenceMedium()

Sender:
ASP.Global_asax