as per the issue if it works for firefox
then we can rule out. History object creating problem.
what abt logs are you getting any error logs in hosted mode.
error log will be silent if you have server side issue, but that should not also be your problem as
it works for the first time, so GET is doing its job,
on that point is your GET request re-entrant. if not then that can be your problem.
thats the only thing i can assume can go wrong when nothining shows up when you hit refresh
check for History object manipulation code , check for GET
maybe you are expecting some cookie in your servlet
i can think if only these two parameter to be the culprit in pure GWT environment