Missing scrollbar thumb with emacsclient

I use emacsclient for most of my editing. Emacsclient is invoked with "emacsclient.emacs23 -a "" -c filename", which first starts emacs server if one is not already running, and then creates a new frame with the buffer containing contents of filename.

For the very first time, when emacs server is started (emacs --daemon) by emacsclient, the scrollbar thumb appears normal in the emacsclient window frame. If I close this frame with "C-C #" and open new one with the same command ("emacsclient.emacs23 -a "" -c filename"), the scrollbar does not show the thumb. Scrolling does work though. In my .emacs I do not have any specific configuration either for scrollbars or for windows. I am not sure what would cause this. Any input is appreciated! Thanks.