Tommy,
Thanks for the name. It's much easier. And, welcome to AC. Definitely, try the Amazing Utilities, but I don' think this will fix your entire issue.
In a true server/client domain, we tend to always blame these issues on DNS. Here, I think it is going to be a networking issue. From what you are saying, it seems like your computers just lose their connection to the server or the database is crashing on the server.
I am not a big believer in Vista yet, although SP1 is coming out anytime. I wouldn't call it downgrading, I would call it "upgrading" to XP, lol. Right now, Tommy, XP Pro is the best OS Windows has ever put out, and it is rock solid as an OS and a network component. I don't think having two switches will cause issues, but I do think it makes sense to get a larger one and use only one.
These may help:
http://cws.internet.com/article/3592-.htmhttp://www.smallbusinesscomputing.com/biztools/article.php/3667576Also, I insure that my databases are truly databases for the network, but only having the AC folder on the server and not the actual program.
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If all else fails, you could actually do it completely the opposite by not running AC on the clients and only running it on the server and sharing out the executable file. This isn't the recommended congig, but last time I tried, it worked fine.
HTH