Thanks to Ton Gerner for suggesting an approach:

The following was once given in this group by Eric Shulman from TiddlyTools.
Since you make a backup, it is save to try.

If you are having problems using the built-in backstage "upgrade" process, 
here's a simple manual procedure that you can use:

   1. Download the latest empty.zip from 
http://www.TiddlyWiki.com<http://www.tiddlywiki.com/> and 
   extract a copy of empty.html
   2. Load your existing TW document into the browser
   3. Invoke "save changes" to create a backup copy of the current document
   4. Replace the existing TW document's file on disk with a copy of the 
   latest empty.html
   5. Invoke "save changes" again
   6. Reload your document



That worked for me using the latest "classic" version I downloaded from 
http://classic.tiddlywiki.com/ (2.8.1 I think). I had some problems with 
the v5 empty.html.

I also had issues with Google Chrome due to Java plugin security (jre7u55), 
it worked better for me in FireFox.

I guess I am on the latest version of the Classic tiddlywiki which is 
solving my immediate issues. Is there a recommended upgrade path to TW5 
where I want to display custom fields? I found that my field data is 
preserved when I view a Tiddler in an upgraded TW5 file, but it does not 
display by default, and when adding new Tiddlers I have to manually add 
each of my custom fields.

On Friday, April 25, 2014 1:05:26 PM UTC-4, Brian Laskey wrote:
>
> I have an older "classic" TiddlyWiki where I have been maintaining some 
> data for past several years, when I first started I created some custom 
> tiddler fields.
>
> After some delay I am getting different errors trying to use the wiki in 
> most modern browsers (Win 7, FF 28.0, IE 11, Chrome 34). Basically I can 
> read the file, but saving updates, or trying to use the core upgrade 
> feature are now failing. I am getting messages that the file has been saved 
> incorrectly. I don't want to lose all my data.
>
> Is there an upgrade path I can take that 1) Preserves my tiddlers with 
> custom field values 2) Preserve my ViewTemplate and 3) Preserve my tag data?
>
> I have tried the online upgrade, but it didn't preserve the fields. Do I 
> want to upgrade to try to resolve the browser errors? Is it best to try to 
> get to TW5 in anticipation that I don't want to be left even further behind 
> and unable to upgrade data?
>
> Are there ways to export the data from a wiki in another format, like a 
> CSV type file for backup purposes?
>
> Thank you
>

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