Reported by Jon Polish http://tech.groups.yahoo.com/group/ecco_pro/message/9285
 
On certain conditions when a column filter is set  Print Preview causes "An application error has occured. Please exit Ecco and restart" error and Ecco hangs.
 
This bug appears in all versions from v4.5.5.0 up to current v4.5.5.6
 
To reproduce:
On new file in notepad "How to use this file"  
- insert existing column "Priority" (Columns|Insert Column|Existing Column or Folder - "Priority")
- set column filter to "Has Value"
- File|Print, check "Print Columns"
- press Preview
"An application error has occured. Please exit Ecco and restart"
 
What is strange - not all columns cause the error - e.g. setting column filter for "Type" column to "Has Value" in "Daily Journal" notepad does not produce the error.