After using 'Edit' -> 'Text extract...', or 'Edit' -> 'Convert to vector
format...' command, the document window shows a completely blank page. In
addition, performing text search causes the document window shows a completely
blank page, if GSview cannot find the text specified by user.

When page goes blank, document commands do not work until opening another file.
In the case of failed text search, GSview redraws the document after performing
a successful text search.
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Ghostscript version (or include output from "gs -h"): 8.62
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Where you got Ghostscript: Ghostscript.com
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Hardware system you are using (including printer model if the problem
involves printing):

Memory: 384MB
CPU: Intel Pentium II 400
Sound: ESS Solo-1
Video: Neomagic MagicMedia 256AV
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Operating system you are using: Windows 98SE
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Suggested fix, if any:

GSview must not alter the contents of the document window after performing any
operations where changing document window is not necessary. Considering
converting a document does not even require the document to be visible on screen
at the first place, it makes no sense to alter the canvas after converting a
document.