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Hi, v.sample fails when creating temp table of sampling points.
It seemed to wrok in processing version of december (didn't track the version).
Here are the log file usefull parts:

Algorithm v.sample - Samples a raster layer at vector point locations. starting...
g.proj -c proj4="+proj=lcc +lat_1=49 +lat_2=44 +lat_0=46.5 +lon_0=3 +x_0=700000 +y_0=6600000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs" 
v.in.ogr min_area=0.0001 snap=-1 dsn="V:/temp_user" layer=stq output=tmp1390228164746 --overwrite -o
r.external input="Z:/Fonds_Thematiques/Donnees_Environnement/durete_eau_interpolation_2013/durete_eau_interpolation_2013.tif" band=1 output=tmp1390228164747 --overwrite -o -r
g.region n=6591625.10761 s=6136625.10761 e=814633.914554 w=286633.914554 res=1000.0
v.sample input=tmp1390228164746 column="classe_dur" raster=tmp1390228164747 z="1" output=output502abf2c9cc74dd29525d0cd58be0a33 --overwrite
v.out.ogr -s -c -e -z input=output502abf2c9cc74dd29525d0cd58be0a33 dsn="V:\\temp\\processing\\007c486d2161423e919eaa214d24ca56" format=ESRI_Shapefile olayer=output type=point

C:\\OSGeo4W64\\bin>set GRASS_VERSION=6.4.0 

GRASS_INFO_MESSAGE(8180,3): Layer: stq 
GRASS_INFO_END(8180,3) 
DBMI-DBF driver error: 
SQL parser error: syntax error, unexpected PRECISION, expecting NAME processing 'precision' 
in statement: 
create table tmp1390228164746 (cat integer, numero varchar ( 254 ), type varchar ( 254 ), code_sandr varchar ( 17 ), code_onema varchar ( 17 ), libelle varchar ( 254 ), etat varchar ( 254 ), date_servi date, date_hs date, mo_numero varchar ( 254 ), mo_raison_ varchar ( 81 ), insee_comm varchar ( 254 ), nom_commun varchar ( 50 ), x double precision, y double precision, geolocalis varchar ( 254 ), code_zone_ varchar ( 254 ), code_cours varchar ( 254 ), code_masdo varchar ( 24 ), code_bv_ma varchar ( 24 ), complement varchar ( 80 ), milieu_lib varchar ( 40 ), source_lib varchar ( 100 ), precision varchar ( 100 ), finalite varchar ( 40 ), precision_ varchar ( 100 ), typologie_ varchar ( 16 ), representa varchar ( 24 ), represen_1 varchar ( 24 ), classe_dur varchar ( 40 ), contexte_p varchar ( 40 ), pauvre_oxy varchar ( 254 ), riche_mo varchar ( 254 ), naturellem varchar ( 254 ), zone_tourb varchar ( 254 ), temp_natur varchar ( 254 ), risque_ass varchar ( 254 ), risque_lac varchar ( 254 ), influence_ varchar ( 254 ), reseaux varchar ( 254 ), ouv_fonc_i varchar ( 21 ), oid integer) 
Error in db_execute_immediate() 

regards,
Régis