The problem can be solved by uploading a NEW installation and then adding the calendar directory you need - if you have multiple calendars...
And DO USE the ftp-script!!!
After that, Upload ONLY the directory with the old calendar data ...
as in /calendarscript/calendars/default/
That should fix the problem with blank screen after upgrading or uploading to a different place/server
Still a problem?
Download the data files in ASCII and then upload them again.
This IS the best Calendar-script Ive seen and he first time Ive had a problem with any of Matts scipts