Please... do not use arswww.cgi anymore... this part of ODWEK is obsolete and deprecated for at least 4 years... I am not even sure if the developpers will ship it with the new release of CMOD coming normally this year...
Since CMOD 8.4 no new features were added to this ODWEK component...
my advice would be, since you have gone through the upgrade to CMOD V9.5, then this component would also need to have a project to be changed asap.
Did you try if ICN was giving you the same problem?
That aside, and back to your problem.
How do you use ARSWWW.CGI? I am asking, because, I have seen many usage of it.
Some customer are using it like a web client, with a modified version of the sample html provided in ODWEK
Some other customers are using arswww.cgi as simply a service calling directly the url with lots of options.
Some other customers did some wrapper around arswww.cgi, and did strange things with the output...
So where are you located?
As web Client?
Direct call to the it with specific parameters?
Or something more strange?
In all cases, what kind of document are wanting to display? PDF? AFP? Line Data (Text)? Tiff? Others???
When you display your file, what do you expect? Acrobat Reader? LineData Applet Viewer? Afp Plugin Viewer? Image Viewer? Something else?
Does it work with other document type, or only with this one specifically?
From which version of CMOD were you before the migration? V9, V8.5, V8.4, V8.3, V7
What did you do with the arswww.cgi upgrade on your http server? did you change the arswww.cgi binaries? Have new links?
Do you see some errors in the logs of your http servers?
Do you see some errors in the browser? Java problems?
lots of questions :-D