I haven't had a chance to try Wybuild yet. I was wondering, does it send a useragent string when it checks for updates?
Yes, wyUpdate sends the useragent string "wyUpdate / VERSION" (e.g. wyUpdate / 2.5.22)
I have had trouble with Clickonce where it seems to send a blank useragent string, and the security at my web hosting provider blocks it from getting files because of this. Will I see the same problem with Wybuild?
Nope, wyUpdate should work fine with your host.
If you have any other questions feel free to ask.