[LV2] Ardour doesn't find lv2

[rosea.grammostola]

Ardour 2 and 3 doesn't find LV2 plugins. I've latest lv2 svn and the 
drobillad repo installed. Hosts such as Carla and lv2rack does find the 
LV2 plugins, which are in the default folder in my Debian install.
lv2ls doesn't find anything.

Configuration of A3 looks good, Paul didn't know what was wrong.

I guess I accidentally removed a folder/file or have some stuff in both 
/usr or /usr/local

Maybe you've some commands for me to analyze what's wrong here?

Best regards,
\r