Converted 2003 worksheets crash 2007 during load

Have eight linked worksheets which load flawlessly in Excel 2003. Have run
through the 2007 conversion to create macro-enabled versions which seemed to
go OK.
On subsequent load by 2007 the first may load OK but then Excel throws an
error saying it needs to close and recover the spreadsheets.
Have gone through them one by one and re-established the links just in case
that was the problem but no good.

Main problem is while the failure generates an error report back to MS I can
see no information which gives an insight into the potential cause.

Any help would be appreciated.