This is an issue I ran into when implementing the spell checker. My client requires the page to handle diacritical marks. I have a section of text that I use to test this functionality.

When the spell checker is invoked on a textarea with this text in it, the following error is generated.

[IndexOutOfRangeException: Index was outside the bounds of the array.]
EO.Web.Internal.me.c(String A_0) +383
EO.Web.Internal.d2.a(String A_0, StringCollection A_1) +539
EO.Web.Internal.d2.b(String A_0, StringCollection A_1) +40
EO.Web.Internal.a.d(String A_0, Hashtable& A_1) +232
EO.Web.Internal.a..ctor(String A_0, Char[] A_1, d2 A_2, Hashtable A_3) +90
EO.Web.Internal.d2.a(String A_0, Boolean A_1, StringCollection A_2) +1021
EO.Web.Internal.d2.c(String A_0, Boolean A_1) +44
EO.Web.Internal.ic.a() +262
EO.Web.Internal.hs.a(String A_0, Int32[] A_1, d2 A_2, Boolean A_3, Boolean A_4, Boolean A_5, Boolean A_6, Int32 A_7) +334
EO.Web.Internal.hs.a(dz A_0, String A_1) +1272
EO.Web.Internal.b6.a(Object A_0, CallbackEventArgs A_1) +34
EO.Web.Callback.a(CallbackEventArgs A_0) +22
EO.Web.Internal.mh.a() +503
EO.Web.Internal.b9.a(EventHandler A_0, Boolean A_1) +35
EO.Web.Control.OnPreRender(EventArgs e) +81
System.Web.UI.Control.PreRenderRecursiveInternal() +80
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +842

Spell checking the following text invokes the error

´ for example á and Á
` for example, è and È
~ as in ñ and Ñ
ç as in façade
¨ as in ü
ˆ as in fête
º as in 1º
ª as in 2ª
¿
¡
ß
«
»

Version 9.0.34.2 no longer breaks on these diacritical marks. Thanks!