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QGIS 3.2.3 Bonn and GRASS 7. r.texture does not provide any output. Not in temp folders, not in user defined folders.
I have tried the function in Windows 10 64bit. On the same systems, QGIS 2.18 provided the outputs fine.

LOG outputs are like this:

Suspicious message "_r was unexpected at this time._"

    Processing algorithm… Algorithm 'r.texture' starting… Input parameters: { '-a' : False, '-s' : False, 'GRASS_REGION_CELLSIZE_PARAMETER' : 0, 'GRASS_REGION_PARAMETER' : None, 'distance' : 1, 'input' : 'C:/Users/.../AppData/Local/Temp/processing_b31ae406d97346319858b8acfa3fe9ea/d40ba480206c44e1855a50ce4442b154/output.tif', 'method' : [0], 'output' : 'C:\Users\...\textures', 'size' : 3 }

    g.proj -c proj4="+proj=utm +zone=...+datum=WGS84 +units=m +no_defs" r.external input="C:\Users...\AppData\Local\Temp\processing_b31ae406d97346319858b8acfa3fe9ea\d40ba480206c44e1855a50ce4442b154\output.tif" band=1 output="rast_5bc7529c4be7121" --overwrite -o g.region n=...s=...e=...w=... res=0.08917000000001485 r.texture input=rast_5bc7529c4be7121 method="asm" size=3 distance=1 output=output0721b2f6bc07456a8304b894c5bcf6e4 --overwrite for r in $(g.list type=rast pattern='output0721b2f6bc07456a8304b894c5bcf6e4*'); do r.out.gdal -m -t input=${r} output=C:\Users...\textures/${r}.tif --overwrite -c createopt="TFW=YES,COMPRESS=LZW" done Starting GRASS GIS...

    WARNING: Concurrent mapset locking is not supported on Windows

    Executing ...

    C:\OSGEO4~1\bin>chcp 1252 1>NUL

    C:\OSGEO4~1\bin>g.proj -c proj4="+proj=utm +zone=...+datum=WGS84 +units=m +no_defs" 

    Default region was updated to the new projection, but if you have multiple mapsets g.region -d should be run in each to update the region from the default

    Projection information updated

    C:\OSGEO4~1\bin>r.external input="C:\Users...\AppData\Local\Temp\processing_b31ae406d97346319858b8acfa3fe9ea\d40ba480206c44e1855a50ce4442b154\output.tif" band=1 output="rast_5bc7529c4be7121" --overwrite -o

    Over-riding projection check

    Reading band 1 of 1...

    r.external complete. Link to raster map created.

    C:\OSGEO4~1\bin>g.region n=...s=... e=...w=... res=0.08917000000001485

    C:\OSGEO4~1\bin>r.texture input=rast_5bc7529c4be7121 method="asm" size=3 distance=1 output=output0721b2f6bc07456a8304b894c5bcf6e4 --overwrite

    Reading raster map...

    Calculating Angular Second Moment...

    2..5..8..11..14..17..20..23..26..29..32..35..38..41..44..47..50..53..56..59..62..65..68..71..74..77..80..83..86..89..92..95..98..100

    r was unexpected at this time.

    C:\OSGEO4~1\bin>for r in $(g.list type=rast pattern='output0721b2f6bc07456a8304b894c5bcf6e4*'); do

    Execution of finished.

    Cleaning up temporary files...

    Press any key to continue . . .

    Starting GRASS GIS...

    WARNING: Concurrent mapset locking is not supported on Windows

    Executing ...

    C:\OSGEO4~1\bin>chcp 1252 1>NUL

    r was unexpected at this time.

    C:\OSGEO4~1\bin>for r in $(g.list type=rast pattern='output0721b2f6bc07456a8304b894c5bcf6e4*'); do

    Execution of finished.

    Cleaning up temporary files...

    Press any key to continue . . .

    Execution completed in 7.08 seconds Results: {'output': 'C:\Users\...\textures'}

    Loading resulting layers Algorithm 'r.texture' finished