airdeu

This also happened to me when moving a wordpress site to another location. Instead of reinstalling, updating the modification date of all files also worked:

find . -exec touch {} \;

(run in ssh console at the root of wordpress directory)

I had the same issue (also hosted on Gandi), running this command on the root of the wordpress folder did the trick for me:

find . -exec touch {} \;

It basically updates the modification date of all files.