After upgrading to Yosemite, I am unable to share screen with Macbook Pro

After upgrading to Yosemite 10.10 on a 2008 MacBook Pro I am unable to "Share Screen" using my authorized user account.  It worked fine before I upgraded to Yosemite. 
I can access "Share Screen" by "requesting permission", but of course this doesn't work unless I am sitting right by the MacBook Pro to give myself permission, which defeats my original purpose for using "Share Screen". 
I attempted to add another authorized "Share Screen" user account, but was unable to access the list of add "Groups and Users" on the host MacBook Pro from the "Share Screen" dialog box.  The dialog box pops up, when I press "+" to add another user, but the list of users fails to appear.  I assume the list of authorized users for screen share has somehow become corrupt. 
All other ways to access "sharing user" accounts appear to be working properly.  I can add and remove other "sharing users" without problems.  For example, I can add a new authorized "file share" user and share files without problems. 
I ran Disk Utility in Recovery Mode and normal mode and corrected all errors, and user permissions on both machines.  I also ran "resetpassword" from Terminal in Recovery Mode and "reset" user permissions.  I am not an experienced Terminal or Recovery Mode user though. 
I also tried turning the Firewall off, to no avail. 
I am attempting to access "Screen Share" on the MacBook Pro via a Macbook Air 13" manufactured mid 2013 also with Yosemite 10.10, however, I also attempted with an older MacBook Air which experiences the same problem. 

Thanks for the idea but it did not work, I do not know why it is asking me for a password which I never needed before for a guest to use the computer?  I have tried everything and I do not know which password it wants?   I do not see any option for a password for the guest account, to create one or delete one or modify it?  Maybe this bug\problem will be addressed in a future update?

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