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No I've never heard about problems specifically with shtml pages - but then again I keep hearing all kinds of problems with InSite.
There are lots of users with no complaints at all, and many of those have submitted hundreds upon hundreds of urls.
Still - the problems reported here never seem to match a distinctive pattern...
Anyway - a PFI program should work reliable and stable.
The only way to handle this is of course to go to Lycos customer support - they are the people you have a deal with.
Did it run smoothly through Brett's Sim spider [searchengineworld.com]?
Did it validate ok through the HTML validator [searchengineworld.com]?
If so, the Insite Select should be able to spider your page. Try the support page [help.lycos.com]?