ssh into linux from powershell only working for root

Hi,
I have a linux install running under virtualbox. I can ssh into it with root and other users fine from dos prompt. When I ssh from powershell though it only works with root userid. When I ssh with the other userid the prompt does not return until I hit enter - it seems to hang. The same thing also happens if I ssh in using root then su - otherid (It also hangs despite the fact I'm already on the server).
Anybody seen this behavior before? Apologies in advance if it should really be a PowerShell question.
Any help much appreciated!