Column renderers/widths disappear?

I have a standalone java swing program in which I have defined three column header renderers to display an icon in the header, two column renderers to format text, and have setMaxWidth on 7 of 9 columns. I don't consider this an excessive amount of column modifications. Some users are reporting (and have sent screen shots) that mysteriously all the columns have reverted to default, equal widths; the header renderers show no icons; and the text formatting renderers show the class name of the object indicating the default renderer is in effect. Extensive, in-house QA never saw this behaviour, however a handful of external users are reporting it.
Has anybody seen anything like this happen? What would cause all the column attributes/renderers to suddenly revert to defaults?
Thanks in advance
John Alfredo

Perhaps more detail is in order.
The project is a form where geologists can enter the legend that attaches to a map. The form is web-accesible. On an HTML page, an applet is supplied a map id and potentially a legend template id as parameters, which it uses to connect to an Oracle database and bring back either a completed legend to modify, a template, or a new blank legend. The user can choose symbolisations, colours, enter a label and type-in a long description. Further they can choose from a list of standardised geology attributes that when combined describe the legend item in a succinct web-searchable way.
The reason I am not doing it the easy way with DHTML is because of two features that are necessary. One is that the user should be able to specify the order of the items at any time, the second is that they should be able to create a hierarchy of items at any time. Moving table rows about and making parent-child relationships in a GUI are just about impossible with HTML so I thought I might be able to do it with Java.
The symbol/colour and long description problems are trivial. What I would like is a column in the table, probably the one where the legend label is shown/entered, that is a tree, to which items may be added or removed as desired and where parent-child relationships may be set up on a button click or two. Further, the last column in the table would contain (in each cell) a table of the standardised attributes and their values, for the item in that row. In order to specify sequence the user should be able to drag and drop rows to where they think they should be (and the hierarchy would change simultaneously).
It is ambitious, particularly since I am a novice in Java, but I can't think of any other way to create a malleable tree stucture that can be manipulated over the web. Can you think of any applications that are currently doing this? Send me a URL if so.
I am most grateful for your help.

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