I'm probably overlooking something simple, but in attempting to postback with a apex:selectList with a size set to 1, nothing happens.  Ever.

I got frustrated and started a brand new visualforce page that exactly mimicked the one found here: https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_compref_selectList.htm

That worked as expected. (The rerender was correct when selecting items from the selectList.)

Then I tweaked it ever so slightly to look like this:

First, the page:

<apex:page controller="sampleCon">
    <apex:form>
        <apex:selectList value="{!countries}" size="1" >
            <apex:selectOptions value="{!items}"/>
        </apex:selectList><p/>

        <apex:commandButton id="thisButton" value="{!countLabel}" action="{!test}" rerender="thisButton"/>

    </apex:form>
</apex:page>

Now my controller:

public class sampleCon {
        String[] countries = new String[]{};
        public String countLabel {get; set;}

        private Integer iClicks {get; set;}
             
        public sampleCon() {
        	iClicks = 1;
        	countLabel = 'Test ' + iClicks;
        }

        public PageReference test() {
        	iClicks++;
        	countLabel = 'Test ' + iClicks;
            return null;
        }
             
        public List<SelectOption> getItems() {
            List<SelectOption> options = new List<SelectOption>();
            options.add(new SelectOption('US','US'));
            options.add(new SelectOption('CANADA','Canada'));
            options.add(new SelectOption('MEXICO','Mexico'));
            return options;
        }
             
        public String[] getCountries() {
            return countries;
        }
             
        public void setCountries(String[] countries) {
            this.countries = countries;
        }      
    }

You'll see that clicking the commandButton does absolutely nothing to the label, nothing changes.  However, if you simply remove the size="1" attribute from the selectList everything will function perfectly. (At least that's what I'm seeing.)

Can anyone else verify, (or refute) this?