It looks like an HTML style comment on a page (like <!--test-->) will make the edit window appear blank when you try to edit the page with konqueror 2.2.1. This is a konqueror bug, not a TWiki bug. I have a few pages where I've run into this problem, but don't know if it happens on every page including an HTML comment. (So far, IIRC, it's only occurred on the Wikilearn web.)
Fortunately, TWiki warns you and prevents you from saving the empty page.
This does not occur with konqueror 2.1.
PS: I guess the reason I didn't get my normal editing template when I created this page was because, at the time I created this page,
WebTopicEditTemplate included an HTML comment.
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RandyKramer - 25 Feb 2002