Having built the new 1.3.38 (and made the necessary changes to run non-root) I find an incompatibility with vdradmin, specifically VDRAdmin 0.97-am3.4.2.
The "Playing Today" and "What's on now" displays are blank. The "Channels" menu works, but all programmes have a date of Thursday 1/1/1970. Timers and Recordings seem OK.
Looking at the output of VDR using svrdpsend.pl it seems the format of EPG responses has changed. This extract is from 1.3.37:
215-c 215-C T-9018-24576-27136 More 4+1 215-E 470 1136726700 6000 50 215-T Lost 215-D (1955) Thriller starring David Farrar as a police officer desperately trying to uncover the whereabouts of the kidnapped baby of American diplomat David Knight and his wife Julia Arnall. [S] 215-X 1 03 eng 215-X 1 03 eng 215-X 2 03 eng 215-X 2 40 eng 215-e
while this is 1.3.38:
215-c 215-C T-9018-24576-27136 More 4+1 215-E 470 1136726700 6000 4F 3 215-T Lost 215-D (1955) Thriller starring David Farrar as a police officer desperately trying to uncover the whereabouts of the kidnapped baby of American diplomat David Knight and his wife Julia Arnall. [S] 215-X 1 03 eng 215-X 1 03 eng 215-X 2 03 eng 215-X 2 40 eng 215-e