[Qgis-user] QGIS3.0.3 under Mac OS X 10.12.6 : SAGA error messages during startup

[Garth Fletcher]

I'm running the latest QGIS3.0.3 under Mac OS X 10.12.6.
It was freshly installed using "QGIS-macOS-3.0.3-1.dmg" from qgis.org

Right after starting QGIS3 I find the following Processing messages in
the Log Messages panel:

2018-05-28T16:37:35 CRITICAL Could not open SAGA algorithm: 
RiverGridGeneration.txt
    'ascii' codec can't decode byte 0xc3 in position 75: ordinal not in 
range(128)
2018-05-28T16:37:35 WARNING Duplicate algorithm name clusteranalysis for 
provider saga
2018-05-28T16:37:35 WARNING Duplicate algorithm name 
confusionmatrixpolygonsgrid for provider saga
2018-05-28T16:37:35 WARNING Duplicate algorithm name 
gwrformultiplepredictors for provider saga
2018-05-28T16:37:35 WARNING Duplicate algorithm name 
gwrforsinglepredictorgriddedmodeloutput for provider saga
2018-05-28T16:37:35 WARNING Duplicate algorithm name 
gwrforsinglepredictorlayer for provider saga
2018-05-28T16:37:35 WARNING Duplicate parameter SEARCH_POINTS_ALL 
registered for alg inversedistanceweightedinterpolation
2018-05-28T16:37:35 WARNING Duplicate parameter SEARCH_POINTS_MAX 
registered for alg inversedistanceweightedinterpolation
2018-05-28T16:37:35 WARNING Duplicate algorithm name clusteranalysis for 
provider saga
2018-05-28T16:37:35 WARNING Duplicate algorithm name difference for 
provider saga
2018-05-28T16:37:35 WARNING Duplicate algorithm name polygonidentity for 
provider saga
2018-05-28T16:37:35 WARNING Duplicate algorithm name intersect for 
provider saga
2018-05-28T16:37:35 WARNING Duplicate algorithm name 
polygonselfintersection for provider saga
2018-05-28T16:37:35 WARNING Duplicate algorithm name 
symmetricaldifference for provider saga
2018-05-28T16:37:35 WARNING Duplicate algorithm name polygonuunion for 
provider saga
2018-05-28T16:37:35 WARNING Duplicate algorithm name regressionkriging 
for provider saga
2018-05-28T16:37:35 WARNING Duplicate algorithm name simplekriging for 
provider saga
2018-05-28T16:37:35 WARNING Duplicate algorithm name polygonupdate for 
provider saga

I checked the file mentioned in the first (CRITICAL) message:
~/QGIS/python/plugins/processing/algs/saga/description/RiverGridGeneration.txt
It does indeed contain 0xc3 at byte 75 - as the Unicode lead-in for an
'a' with umlaut (diaeresis) mark.  There are also 2 other cases later
in the file for 'u' with umlaut.

However, when I edited the file to replace the ä and ü with plain ASCII,
this had no effect on the next QGIS3 startup - same error.  Perhaps the
"RiverGridGeneration.txt" data is cached somewhere?

So, my 2 questions are:
1) how to fix the CRITICAL error
2) what are the implications, if any, of the WARNING messages

I hope someone can help. Many thanks,
-- 
Garth Fletcher