[TYPO3-seminars] List of registrations not working since update to Seminar Manager 0.9.6

[rsbrux]

Since I updated to seminars 0.9.6 , all "List of registrations" links in my
Typo3 v4.5 installation deliver a blank page.

I am not aware of any other change which might have caused this, nor do I
find the excellent and detailed instructions which I used to set this up
originally (a year or two ago).

Any hints as to where to look or how to troubleshoot this would be most
welcome!