Hi, thanks for your bug report. You can try to install the package xvnc4viewer, which is a better vnc client. (tsclient uses it behind the scenes).
About the second issue, it's a know issue, see bug 8422.
** Changed in: tsclient (Ubuntu)
Status: Unconfirmed => Rejected
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Scrollbars poorly implemented in "VNC Viewer" Terminal Server
https://launchpad.net/bugs/51741
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