There must be some settings that have changed in the background somewhere... or the new host (different php version) isn't as compatible with the database, as it was using a different version of php at the old host.

Every time I try to post up something with more than 3 or 4 URLs (links) in the post, I get a full-screen "404 error"... and I NEED to be able to post up lots of reference links in my news postings.
(last night I had to remove a quoted link to allow the post to go through, and tonight I had to make two posts in the online sightings topic just to include all of the items I was wanting to post about)

I can't see anything in the board's admin options page about it, and I haven't seen anything on the hosting side of things that could cause it.
(next time it happens, I'll see if it happens with a different type of browser, just in case it is a browser error, and not a board error)