Hi Thorsten,
Great. We already did our migration to 7.8 on Saturday (had to - sorry), but will be happy to test that 
and yes we are on Linux x86_64 (sorry for not mentioning).
I don't like to sound too greedy, but we seem to have discovered some other little loader problems that we needed to circumvent:
- Sequences and their GRANTs seem to be missing from the Export (which was important for us)
- GRANTs on FUNCTIONs (grant execute on ...) seem to be missing from the Export
By the way one more novice question: I could not find a system table holding those execute rights on functions like 'FUNCTIONPRIVILEGES'. Where are these kept?
Best Regards,
Urs