Thanks, – sorry for the delay. For some reason I didn't get notified of your reply to my post; just happened to be back in here and noticed it and another reply on one of my other posts.
Fortunately, the page error I reported above (1/5@1:13pm) is isolated to my virtual PC server environment. My colleagues have not had the same issue installing 5.4 and using it. My subsequent post (1/6@4:02pm) mentions that we were indeed able to reproduce the numeric field validation problem, though. If you have access to the case management system, the attachments are there on #868109. If not, let me know and I will send them (let me know to where). Keep in mind, though, that it has already been acknowledged as a bug, so someone at Quest is already investigating it – just in case you don't want to be doing redundant work .