I noticed a bug in MultiSelect - when you try to clear field via reset(), or clearValue(), or clearTrigger button before pressing the dropdown list button the error "this.view has no properties" occurs. Looking at code I've found that this.view is assigned in initList(), so this.view is null till the dropdown list is shown. Maybe you should add check this.view == null in reset() and clearValue()?
Pff - I have to say that this time I'm caught off guard.
@pozirk - I cannot reproduce your weird behavior in Firefox2 or IE7, by accessing your testcase. Are you using another browser? I'm open for discussion - please provide a specific step1, step2, etc. in order to reproduce the weird situation.
@diehard_mib - well, in 0.4 there is actually a check on clearValue and reset (if this.view then this.view.clearSelections
@apaa - yes, there is a minChars config property, as it inherits that from Ext.form.ComboBox - please bare in mind that it is 0 if the store is local, as it is described in the ComboBox help page
I will soon update to 0.4.1 with a small fix, and also upgrade the live demo