Steps to Reproduce

Run fiddle:
http://zkfiddle.org/sample/3op5ibq/1-Frozen-static-columns-disapear

drag the frozen listbox scrollbar to any position other than initial.
using paginitation to go to a another page

Note: also affect smooth scrolling

Current Result

Columns without sizing information disapear

Expected Result

Paging shouldn't cause the columns to disapear

Debug Info

caused by columns having no sizing information and no initial size, which leads the Frozen.doScrollNow_() method to incorrectly calculate a width of 0px for these columns

Root Cause

in this for loop in the cellWidth variable default to 0 if no sizing is given instead of the default width.
https://github.com/zkoss/zk/blob/f244e4ddc14b627616d92449c6759641b7afb07f/zul/src/archive/web/js/zul/mesh/Frozen.js#L339

Workaround

use hflex='min' on these columns to have the same presentation, but including column sizing info.