egroupware edits broken after migration

Hi,
I've migrated egroupware from solaris 10 on sparc to x86. I've sourced packages from the same source at opencsw.org for apache, php, mysql etc. Apache (now 2.2.11 up from 2.2.9?) and php (now 5.2.9) were marginally later versions, mysql is same at 5.0. I moved the egroupware code from old server to new server as is. The egroupware version is snapshot 2009/03/09 with the syncml patches and WAS working fine on the old server.

Everything works fine on the new server except when I go to edit something. eg an existing calendar appointment (but similar probs with address book)

the error in the browser is:
Error!
Remote server or file not found

You tried to access the address https://<my.server>t/egroupware/index.php?menuaction=calendar.calendar_uiforms.edit&cal_id=1078&date=20090711, which is currently unavailable. Please make sure that the Web address (URL) is correctly spelled and punctuated, then try reloading the page.
Make sure your Internet connection is active and check whether other applications that rely on the same connection are working.

the apache error log has:
[Thu Jul 09 19:29:04 2009] [error] [client 192.168.200.203] PHP Warning:  Can't load stream-wrapper for scheme 'links'! in /opt/www/eGroupware-1.6-snapshot-20090309/phpgwapi/inc/class.vfs_stream_wrapper.inc.php on line 760, referer: https://<my.server>/egroupware/?menuaction=calendar.calendar_uiviews.index
[Thu Jul 09 19:29:04 2009] [error] [client 192.168.200.203] PHP Warning:  filectime() [function.filectime]: stat failed for /opt/www/egroupware/etemplate/js/etemplate.js in /opt/www/eGroupware-1.6-snapshot-20090309/etemplate/inc/class.etemplate.inc.php on line 2166, referer: https://<my.server>/egroupware/?menuaction=calendar.calendar_uiviews.index
[Thu Jul 09 19:29:04 2009] [error] [client 192.168.200.203] PHP Warning:  filemtime() [function.filemtime]: stat failed for /opt/www/egroupware/etemplate/templates/default/app.css in /opt/www/eGroupware-1.6-snapshot-20090309/etemplate/inc/class.etemplate.inc.php on line 249, referer: https://<my.server>/egroupware/?menuaction=calendar.calendar_uiviews.index
[Thu Jul 09 19:29:04 2009] [error] [client 192.168.200.203] PHP Fatal error:  Class 'tplsavant2' not found in /opt/www/eGroupware-1.6-snapshot-20090309/phpgwapi/templates/idots/class.idots_framework.inc.php on line 68, referer: https://<my.server>/egroupware/?menuaction=calendar.calendar_uiviews.index

I tried going to a later snapshot but same problem so I've reverted to what was working on the old server.

It's probably something simple that I have missed but ATM I have no clue.

I've googled and found this post with the same problem but no resolution:
 http://www.nabble.com/Tracker-:-blank-page-since-upgrade-to-1.6-p21457088s3741.html

Any assistance greatly appreciated.

Cheers
P