Screen sharing doesn't work in Yosemite

Screen sharing gives this message on my iMac :
Process:
Screen Sharing [46463]
Path:
/Volumes/*/Screen Sharing.app/Contents/MacOS/Screen Sharing
Identifier:
com.apple.ScreenSharing
Version:
Build Info:
RemoteDesktop-3009915~3
Code Type:
X86 (Native)
Parent Process:
??? [1]
Responsible:
Screen Sharing [46463]
User ID:
502
Date/Time:
2015-01-27 13:31:28.148 +0100
OS Version:
Mac OS X 10.10.1 (14B25)
Report Version:
11
Anonymous UUID:
7E87A766-A68F-42AB-5776-3EC4CEE0DBC9
Sleep/Wake UUID:
E9049456-0F35-432F-A16C-0C7313FDA6B0
Time Awake Since Boot: 1300000 seconds
Time Since Wake:
3100 seconds
Crashed Thread:
0
Exception Type:
EXC_BREAKPOINT (SIGTRAP)
Exception Codes:
0x0000000000000002, 0x0000000000000000
Application Specific Information:
dyld: launch, loading dependent libraries
Dyld Error Message:
Library not loaded: /System/Library/PrivateFrameworks/ScreenSharing.framework/Versions/A/ScreenShar ing
Referenced from: /Volumes/*/Screen Sharing.app/Contents/MacOS/Screen Sharing
Reason: no suitable image found. Did find:
    /System/Library/PrivateFrameworks/ScreenSharing.framework/Versions/A/ScreenShar ing: mach-o, but wrong architecture
Binary Images:
0x8fe0c000 - 0x8fe3fe03 dyld (353.2.1) <EBFF7998-58E8-32F5-BF0D-9690278EC792> /usr/lib/dyld
0x92b00000 - 0x92b00fff com.apple.Carbon (154 - 157) <5A078967-8437-3721-A6B1-70CC00461D7B> /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon
0x9323b000 - 0x933ffff3 com.apple.QuartzCore (1.10 - 361.11) <9CED60CF-9B7F-3288-A7E9-3AE087F9E076> /System/Library/Frameworks/QuartzCore.framework/Versions/A/QuartzCore
0x9376c000 - 0x939e8ff3 com.apple.security (7.0 - 57031.1.35) <4721C22E-D6C2-3202-B80D-5E67169466D2> /System/Library/Frameworks/Security.framework/Versions/A/Security
And a similar message on my MacBook Pro

same here on a 2010 macbook pro. i routinely use screen sharing to access that MBP from a 2010 mac pro. but ever since installing lion on the MBP (now 10.7.1), i'm asked for my "Kerberos password" -- and i've never even heard of such a thing.
so far, googling this has not led to anything helpful.
i love my macs, but stuff like this that impedes our productivity is a monumental drag (to say the least).

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By "usual gateway", are you referring to a hardware device — commonly called a "gateway router" — that's been replaced here, or to the IP gateway settings present within most (all?) hosts on an IP network?
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Hi!
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Hi,
Welcome to the  Discussions
The Connection Doctor gives a shortened form of the Error message.
The Pop up (Send to Apple) has a Reveal Triangle next to the word Details.
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Port 5190
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Help viewer is your, usually underrated, friend
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edit
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Message was edited by: Wayne

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*edit*
Just a thought, would the type of account make a difference? At the moment we are both using the type of accounts that iChat creates when you select "get an iChat account" (creates a [email protected] login)
Message was edited by: Wayno

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