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Frontpage uses alot of system resources on the server (so I am told) and if you are on shared box it will freeze and give (server at "" not responding) message. This has happened to me a few times with a several thousand page site. If you are getting this type of "timeout" on a shared server you need to call your webhost. If you have built your site without using separate "webs" for each area of your site (like one giant web) this is what it could be.
But without knowing your situation this is merely a guess.
and is the not responding message coming from frontpage or your OS (windows?)
if these webs you are trying to open are based on your computer then id guess its more to do with the program. If the websites youre editing are actually on the web, then try opening an offline website and see if you get the same problem...then you can narrow it down to it being an online issue or the prog.
I haven't seen that exact case before but have had a couple of similar problems that had to do with corrupted DLLs or something related.
In each case I had to uninstall *all* of MS Office and then reinstall. A real headache considering that it includes reconfiguring Outlook accounts and Norton AV.
But, first things first. Search the MS support sight with the *exact* error message and see what pops up. Then try their FP support forum. It's a bit clunky but I sometimes find what I need there.