Is it just me or is anyone else experiencing error messages when displaying the Calendar page ??

I get the following at the top of the page:

• Warning: Illegal string offset 'data' in template_preprocess_calendar_month() (line 38 of D:\web sites\drupal7\sites\www.brc.ac.uk.psl\modules\calendar\theme\theme.inc).
• Warning: Illegal string offset 'data' in template_preprocess_calendar_month() (line 43 of D:\web sites\drupal7\sites\www.brc.ac.uk.psl\modules\calendar\theme\theme.inc).
• Warning: Illegal string offset 'data' in template_preprocess_calendar_month() (line 38 of D:\web sites\drupal7\sites\www.brc.ac.uk.psl\modules\calendar\theme\theme.inc).
• Warning: Illegal string offset 'data' in template_preprocess_calendar_month() (line 43 of D:\web sites\drupal7\sites\www.brc.ac.uk.psl\modules\calendar\theme\theme.inc).
• Warning: Illegal string offset 'data' in template_preprocess_calendar_month() (line 38 of D:\web sites\drupal7\sites\www.brc.ac.uk.psl\modules\calendar\theme\theme.inc).
• Warning: Illegal string offset 'data' in template_preprocess_calendar_month() (line 43 of D:\web sites\drupal7\sites\www.brc.ac.uk.psl\modules\calendar\theme\theme.inc).
• Warning: Illegal string offset 'data' in template_preprocess_calendar_month() (line 38 of D:\web sites\drupal7\sites\www.brc.ac.uk.psl\modules\calendar\theme\theme.inc).
• Warning: Illegal string offset 'data' in template_preprocess_calendar_month() (line 43 of D:\web sites\drupal7\sites\www.brc.ac.uk.psl\modules\calendar\theme\theme.inc).
• Warning: Illegal string offset 'data' in template_preprocess_calendar_month() (line 38 of D:\web sites\drupal7\sites\www.brc.ac.uk.psl\modules\calendar\theme\theme.inc).
• Warning: Illegal string offset 'data' in template_preprocess_calendar_month() (line 43 of D:\web sites\drupal7\sites\www.brc.ac.uk.psl\modules\calendar\theme\theme.inc).

I am running Aurora/Firefox - latest version on a Windows-7 box with 4Gb RAM.

Cheers

Steve