Screen Sharing between Mountain Lion and Tiger not working

rMBP running 10.8.2 ML and a G3 iMac running 10.4.11 Tiger.
When I try and use Screen Sharing on the MBP to connect to the G3 it prompts for both a username and password. I enter a valid user and pw but it fails with
Authenication failed to "Ruby".
Please verify you have entered the correct name and password.
Third-party VNC clients, e.g. JollysFastVNC on my MBP and Remoter on my iPhone, can connect fine, but they only request a password.
Any ideas?

I've been using Screen Share on my home network for a very long time.  My most used computer, MacBook Pro (2011) was just upgraded to ML, my desktop still has Lion on it - and can't be upgraded because it is an early MacPro.  I was having intermittant problems getting the MBPro to connect to the MPro screen, and resetting the PRAM was correcting it (but it could have been the rebooting process alone - I don't know).  Now I can share the MPro disks on my network but not the screen.  Now, to me, that's wierd.  I've tried doing all kinds of setting checks, preference removal, etc.  No luck.  I can, however (as someone above mentioned) connect from my MPro (Lion) to my MBPro (ML) screen.  I've checked my Intego VirusBarrier X6 settings, i.e. blocked addresses (in the past that has happened and blocked) and I've even entered my MBPro address into the approved address section.  I've checked/rechecked the Sharing Preferences, turned them on/off, etc.  All to no avail.
Is this a Mountain Lion / Lion issue, a Mountain Lion issue, or something somewhere corrupt?  I used to have Remote Desktop on the MPro, but for my needs Screen Share & Disk Share suit my needs on my home network.  I have LogMeInIgnition, which when the last time I tried to connect to the MBPro it showed it offline - and it isn't.  I feel there's something in ML blocking things.
I'm open to suggestions, and a fix if needed.  This is frustrating.  Not that I can't use the exercise to walk to the room where the MPro is - not the point. 
Tom

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