Can't access Dashboard after upgrading to 5.6.3.4

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Just finished upgrading from 5.6.2.1 to 5.6.3.4.
The site is working, but can't access the Dashboard -> 'An unexpected error occurred'.
Steps taken to resolve:
- I've checked the database version and it is 5.6.3.4
- I've checked the config.php and it contains : define('DIRNAME_APP_UPDATED', 'concrete5.6.3.4')
- I've checked version.php and it showed : $APP_VERSION = '5.6.2.1';
- I manually cleared the 'Cache'
- the update folder contains version 5.6.3.4
No luck.

I then tried manual update as per the instructions for Method 2 here: http://www.concrete5.org/documentation/how-tos/developers/manually-... and replaced the old 5.6.2.1 core with 5.6.3.4.

But still the same problem, site is working but can't access the dashboard.

Can anyone advice on what we can do?

 
BirgirGisla replied on at Permalink Reply
This issue has been resolved by great help from TM Designs. We rolled back to previous version of C5 and then upgraded to 5.6.3.3, since 5.6.3.4 has been pulled down (for the moment) as being stable version.
DavidLLewis replied on at Permalink Reply
I seem to have the same problem today but am unable to get back to an earlier version - Is there any further update on this problem?

Many thanks
David